[PATCH] Fix dllexport mangling issue

[klutzy]

When a symbol is dllexported, LLVM wrongly mangled its name (`func` to
`_func` or `_func at 16` for example). It caused linker error since linker
doesn't accept mangled name for dllexport.

This patch fixes Bug 10174.
---
 lib/Target/X86/X86AsmPrinter.cpp | 30 +++++++++++-------
 test/CodeGen/X86/dllexport.ll    | 68 ++++++++++++++++++++--------------------
 test/MC/COFF/linker-options.ll   |  2 +-
 3 files changed, 54 insertions(+), 46 deletions(-)
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