[PATCH] [-cxx-abi microsoft] Mangle declarations inside of extern "C" functions

[David Majnemer]

Hi pcc, rnk, cdavis5x, timurrrr, whunt,

Main and extern "C" functions are very special.  main in particular has
a unique mangling regardless of how it is phrased:
(int main(void), int main(int, char * []), int main(int, char **)) all
are mangled the same when in contexts that aren't "bare-function"

extern "C" functions don't get their parameter or return types mangled.

Furthermore, declaration mangling for extern "C" functions in template
arguments works out completely differently.

To get this much right, the logic behind working out which declarations
needed "C++" mangling had to be reworked.

Note, this *still* doesn't catch all of the corner cases...

http://llvm-reviews.chandlerc.com/D1627

Files:
  lib/AST/MicrosoftMangle.cpp
  test/CodeGenCXX/mangle-ms-extern-local.cpp
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