[PATCH] CodeGen: Don't form weak dllexport aliases

[David Majnemer]

Hi hans,

The MS linker cannot do anything interesting with these, it doesn't make
sense to emit them.

This fixes PR21373.

http://reviews.llvm.org/D5986

Files:
  lib/CodeGen/CGCXX.cpp
  test/CodeGenCXX/dllexport.cpp
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