Update last seen line info in the assertionEnded fast path

This costs us about 1% perf in Debug build and 3% in Release build,
but it is worth it for more precise information during unexpected
exceptions or fatal errors.

Given a simple test case like this
```cpp
TEST_CASE("Hard fail") {
    REQUIRE( 1 == 1 );
    REQUIRE( 2 == 2 );
    throw 1;
    REQUIRE( 3 == 3 );
}
```

Catch2 before this change would report the line info from the
`TEST_CASE` macro as the last seen expression before error. With
this change, it will correctly report the line info from the
`REQUIRE(2 == 2)` assertion as the last seen expression before error.

src/catch2/internal/catch_run_context.cpp

@@ -515,7 +515,8 @@ namespace Catch {
          return m_lastAssertionPassed;
     }
 
-    void RunContext::assertionPassed() {
+    void RunContext::assertionPassedFastPath(SourceLineInfo lineInfo) {
+        m_lastKnownLineInfo = lineInfo;
         m_lastAssertionPassed = true;
         ++m_totals.assertions.passed;
         m_messageScopes.clear();
@@ -603,7 +604,8 @@ namespace Catch {
 
         if( result ) {
             if (!m_includeSuccessfulResults) {
-                assertionPassed();
+                // Fast path if neither user nor reporter asked for passing assertions
+                assertionPassedFastPath(info.lineInfo);
             }
             else {
                 reportExpr(info, ResultWas::Ok, &expr, negated);

src/catch2/internal/catch_run_context.hpp

@@ -108,7 +108,7 @@ namespace Catch {
 
         bool lastAssertionPassed() override;
 
-        void assertionPassed();
+        void assertionPassedFastPath(SourceLineInfo lineInfo);
 
     public:
         // !TBD We need to do this another way!