[PATCH 0/1] MR2685: msvcrt: Fix crash when rethrowing after a non-C++ exception on x86_64.

[Brendan Shanks (＠bshanks)]

This fixes a crash seen with the .NET Framework 3.5 SP1 installer in a 64-bit prefix where `ServiceModelReg.exe` throws a C++ exception, it's rethrown again, then a CLR exception (`0xe0434f4d`) exception is thrown, and finally there's another C++ rethrow.

At the last rethrow, `cxx_frame_handler()` detects the rethrow and sets `*rec` to the previous exception record, which is the CLR exception, not the C++ exception. If `+seh` is enabled, it then assumes `*rec` is a C++ exception and tries to TRACE info about it, which crashes.

Move the rethrow detection before the exception type check, so the TRACEs are not done.