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

[Timur Iskhodzhanov]

Hi majnemer, echristo,

David, Eric,

This is a preliminary version.
I haven't updated some of the test/DebugInfo/COFF lit tests since changing the code just a little [which might happend during the review] requires significant amount of work to update the tests.
Please comment on the code and an example test modification and I'll update the rest of the tests if everything's OK with you.

--
Tim

http://reviews.llvm.org/D5772

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