Avoid warnings for functions that return a value using MS-style inline

assembly code.  This avoids changing the bahvior when normal asm("")
statements are used.

The type of code affected would be:

  void* t4(void) { __asm mov eax, fs:[0x10] }

I hope people like this version, if not, let me know.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@92531 91177308-0d34-0410-b5e6-96231b3b80d8