Microsoft X64 Mangling

[Warren Hunt]

I've put together a patch that fixes all of the issues I found with
Microsoft name mangling in 64-bit mode.  Mostly it involves adding an 'E'
note to all pointers that are 64-bit (including 'this' pointers).  This is
done in MicrosoftMangle.cpp.  I've updated 3 of the mangling test files
with X64 tests, which provides some reasonable amount of coverage.

Please review.

Thanks,
-Warren

(Note: This is my first patch.)
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