Support custom allocators in vector Matchers (#1909)

-- Combined with f4fc2dab2c
   during cherry-picking.

tests/SelfTest/Baselines/xml.sw.approved.txt

@@ -14099,9 +14099,17 @@ There is no extra whitespace here
               { 1.0, 2.0, 3.0 } is approx: { 1.0, 2.0, 3.0 }
             </Expanded>
           </Expression>
-          <OverallResults successes="1" failures="0" expectedFailures="0"/>
+          <Expression success="true" type="REQUIRE_THAT" filename="tests/<exe-name>/UsageTests/Matchers.tests.cpp" >
+            <Original>
+              v1, Approx&lt;double>({ 1., 2., 3. })
+            </Original>
+            <Expanded>
+              { 1.0, 2.0, 3.0 } is approx: { 1.0, 2.0, 3.0 }
+            </Expanded>
+          </Expression>
+          <OverallResults successes="2" failures="0" expectedFailures="0"/>
         </Section>
-        <OverallResults successes="1" failures="0" expectedFailures="0"/>
+        <OverallResults successes="2" failures="0" expectedFailures="0"/>
       </Section>
       <Section name="Vectors with elements" filename="tests/<exe-name>/UsageTests/Matchers.tests.cpp" >
         <Section name="Different length" filename="tests/<exe-name>/UsageTests/Matchers.tests.cpp" >
@@ -14200,7 +14208,15 @@ There is no extra whitespace here
             { 1, 2, 3 } Contains: 2
           </Expanded>
         </Expression>
-        <OverallResults successes="2" failures="0" expectedFailures="0"/>
+        <Expression success="true" type="CHECK_THAT" filename="tests/<exe-name>/UsageTests/Matchers.tests.cpp" >
+          <Original>
+            v5, (VectorContains&lt;int, CustomAllocator&lt;int>>(2))
+          </Original>
+          <Expanded>
+            { 1, 2, 3 } Contains: 2
+          </Expanded>
+        </Expression>
+        <OverallResults successes="3" failures="0" expectedFailures="0"/>
       </Section>
       <Section name="Contains (vector)" filename="tests/<exe-name>/UsageTests/Matchers.tests.cpp" >
         <Expression success="true" type="CHECK_THAT" filename="tests/<exe-name>/UsageTests/Matchers.tests.cpp" >
@@ -14211,6 +14227,22 @@ There is no extra whitespace here
             { 1, 2, 3 } Contains: { 1, 2 }
           </Expanded>
         </Expression>
+        <Expression success="true" type="CHECK_THAT" filename="tests/<exe-name>/UsageTests/Matchers.tests.cpp" >
+          <Original>
+            v, Contains&lt;int>({ 1, 2 })
+          </Original>
+          <Expanded>
+            { 1, 2, 3 } Contains: { 1, 2 }
+          </Expanded>
+        </Expression>
+        <Expression success="true" type="CHECK_THAT" filename="tests/<exe-name>/UsageTests/Matchers.tests.cpp" >
+          <Original>
+            v5, (Contains&lt;int, std::allocator&lt;int>, CustomAllocator&lt;int>>(v2))
+          </Original>
+          <Expanded>
+            { 1, 2, 3 } Contains: { 1, 2 }
+          </Expanded>
+        </Expression>
         <Expression success="true" type="CHECK_THAT" filename="tests/<exe-name>/UsageTests/Matchers.tests.cpp" >
           <Original>
             v, Contains(v2)
@@ -14235,7 +14267,23 @@ There is no extra whitespace here
             {  } Contains: {  }
           </Expanded>
         </Expression>
-        <OverallResults successes="4" failures="0" expectedFailures="0"/>
+        <Expression success="true" type="CHECK_THAT" filename="tests/<exe-name>/UsageTests/Matchers.tests.cpp" >
+          <Original>
+            v5, (Contains&lt;int, std::allocator&lt;int>, CustomAllocator&lt;int>>(v2))
+          </Original>
+          <Expanded>
+            { 1, 2, 3 } Contains: { 1, 2, 3 }
+          </Expanded>
+        </Expression>
+        <Expression success="true" type="CHECK_THAT" filename="tests/<exe-name>/UsageTests/Matchers.tests.cpp" >
+          <Original>
+            v5, Contains(v6)
+          </Original>
+          <Expanded>
+            { 1, 2, 3 } Contains: { 1, 2 }
+          </Expanded>
+        </Expression>
+        <OverallResults successes="8" failures="0" expectedFailures="0"/>
       </Section>
       <Section name="Contains (element), composed" filename="tests/<exe-name>/UsageTests/Matchers.tests.cpp" >
         <Expression success="true" type="CHECK_THAT" filename="tests/<exe-name>/UsageTests/Matchers.tests.cpp" >
@@ -14265,6 +14313,14 @@ There is no extra whitespace here
             {  } Equals: {  }
           </Expanded>
         </Expression>
+        <Expression success="true" type="CHECK_THAT" filename="tests/<exe-name>/UsageTests/Matchers.tests.cpp" >
+          <Original>
+            v, Equals&lt;int>({ 1, 2, 3 })
+          </Original>
+          <Expanded>
+            { 1, 2, 3 } Equals: { 1, 2, 3 }
+          </Expanded>
+        </Expression>
         <Expression success="true" type="CHECK_THAT" filename="tests/<exe-name>/UsageTests/Matchers.tests.cpp" >
           <Original>
             v, Equals(v2)
@@ -14273,7 +14329,23 @@ There is no extra whitespace here
             { 1, 2, 3 } Equals: { 1, 2, 3 }
           </Expanded>
         </Expression>
-        <OverallResults successes="3" failures="0" expectedFailures="0"/>
+        <Expression success="true" type="CHECK_THAT" filename="tests/<exe-name>/UsageTests/Matchers.tests.cpp" >
+          <Original>
+            v5, (Equals&lt;int, std::allocator&lt;int>, CustomAllocator&lt;int>>(v2))
+          </Original>
+          <Expanded>
+            { 1, 2, 3 } Equals: { 1, 2, 3 }
+          </Expanded>
+        </Expression>
+        <Expression success="true" type="CHECK_THAT" filename="tests/<exe-name>/UsageTests/Matchers.tests.cpp" >
+          <Original>
+            v5, Equals(v6)
+          </Original>
+          <Expanded>
+            { 1, 2, 3 } Equals: { 1, 2, 3 }
+          </Expanded>
+        </Expression>
+        <OverallResults successes="6" failures="0" expectedFailures="0"/>
       </Section>
       <Section name="UnorderedEquals" filename="tests/<exe-name>/UsageTests/Matchers.tests.cpp" >
         <Expression success="true" type="CHECK_THAT" filename="tests/<exe-name>/UsageTests/Matchers.tests.cpp" >
@@ -14284,6 +14356,14 @@ There is no extra whitespace here
             { 1, 2, 3 } UnorderedEquals: { 1, 2, 3 }
           </Expanded>
         </Expression>
+        <Expression success="true" type="CHECK_THAT" filename="tests/<exe-name>/UsageTests/Matchers.tests.cpp" >
+          <Original>
+            v, UnorderedEquals&lt;int>({ 3, 2, 1 })
+          </Original>
+          <Expanded>
+            { 1, 2, 3 } UnorderedEquals: { 3, 2, 1 }
+          </Expanded>
+        </Expression>
         <Expression success="true" type="CHECK_THAT" filename="tests/<exe-name>/UsageTests/Matchers.tests.cpp" >
           <Original>
             empty, UnorderedEquals(empty)
@@ -14308,7 +14388,23 @@ There is no extra whitespace here
             { 2, 3, 1 } UnorderedEquals: { 1, 2, 3 }
           </Expanded>
         </Expression>
-        <OverallResults successes="4" failures="0" expectedFailures="0"/>
+        <Expression success="true" type="CHECK_THAT" filename="tests/<exe-name>/UsageTests/Matchers.tests.cpp" >
+          <Original>
+            v5, (UnorderedEquals&lt;int, std::allocator&lt;int>, CustomAllocator&lt;int>>(permuted))
+          </Original>
+          <Expanded>
+            { 1, 2, 3 } UnorderedEquals: { 2, 3, 1 }
+          </Expanded>
+        </Expression>
+        <Expression success="true" type="CHECK_THAT" filename="tests/<exe-name>/UsageTests/Matchers.tests.cpp" >
+          <Original>
+            v5_permuted, UnorderedEquals(v5)
+          </Original>
+          <Expanded>
+            { 1, 3, 2 } UnorderedEquals: { 1, 2, 3 }
+          </Expanded>
+        </Expression>
+        <OverallResults successes="7" failures="0" expectedFailures="0"/>
       </Section>
       <OverallResult success="true"/>
     </TestCase>
@@ -17636,7 +17732,7 @@ loose text artifact
       </Section>
       <OverallResult success="true"/>
     </TestCase>
-    <OverallResults successes="1728" failures="149" expectedFailures="21"/>
+    <OverallResults successes="1740" failures="149" expectedFailures="21"/>
   </Group>
-  <OverallResults successes="1728" failures="148" expectedFailures="21"/>
+  <OverallResults successes="1740" failures="148" expectedFailures="21"/>
 </Catch>