[PATCH] Fix PR21189 -- Emit symbol subsection required to debug LLVM-built binaries with VS2012+

[Timur Iskhodzhanov]

Rebase now that r220526 has landed.

http://reviews.llvm.org/D5772

Files:
  lib/CodeGen/AsmPrinter/WinCodeViewLineTables.cpp
  test/DebugInfo/COFF/simple.ll
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