Don't reconstruct expression on encountering fatal error

In some cases, like when given

```cpp
std::vector<char>* str =
reinterpret_cast<std::vector<char>*>(0x1234458);
CHECK(*str == std::vector<char>());
```

reconstructing the expression to report it would cause another fatal
error. Instead we just put together an AssertionResult without
reconstructing the expression fully.

This should fully fix #810

include/internal/catch_fatal_condition.hpp

@@ -53,7 +53,6 @@ namespace Catch {
         static LONG CALLBACK handleVectoredException(PEXCEPTION_POINTERS ExceptionInfo) {
             for (int i = 0; i < sizeof(signalDefs) / sizeof(SignalDefs); ++i) {
                 if (ExceptionInfo->ExceptionRecord->ExceptionCode == signalDefs[i].id) {
-                    reset();
                     reportFatal(signalDefs[i].name);
                 }
             }

include/internal/catch_run_context.hpp

@@ -224,10 +224,14 @@ namespace Catch {
         }
 
         virtual void handleFatalErrorCondition( std::string const& message ) {
-            ResultBuilder resultBuilder = makeUnexpectedResultBuilder();
-            resultBuilder.setResultType( ResultWas::FatalErrorCondition );
-            resultBuilder << message;
-            resultBuilder.captureExpression();
+            // Don't rebuild the result -- the stringification itself can cause more fatal errors
+            // Instead, fake a result data.
+            AssertionResultData tempResult;
+            tempResult.resultType = ResultWas::FatalErrorCondition;
+            tempResult.message = message;
+            AssertionResult result(m_lastAssertionInfo, tempResult);
+
+            getResultCapture().assertionEnded(result);
 
             handleUnfinishedSections();