[PATCH] Refactor llvm-symbolizer to support using PDB instead of DWARF.

[Zachary Turner]

Hi samsonov,

In order to make llvm-symbolizer work on Windows, a first step is to remove the assumption that DebugInfo will be in DWARF format.  In theory this is simple, because there are only about 2 places where llvm-symbolizer actually queries the DWARF.  In practice abstracting this away turned out to be a bit of a large refactor.  Basically instead of storing DIContext directly we introduce abstract classes `SymbolizationContext`, `SymbolizedLineInfo`, and `SymbolizedInliningInfo`.  Concrete implementations of each of these are provided for the DWARF case as well as the PDB case.  The PDB cases are not filled out yet, I planned to do that in a separate CL to keep this from getting too big.

http://reviews.llvm.org/D9111

Files:
  include/llvm/DebugInfo/DWARF/DIContext.h
  tools/llvm-symbolizer/CMakeLists.txt
  tools/llvm-symbolizer/LLVMSymbolize.cpp
  tools/llvm-symbolizer/LLVMSymbolize.h
  tools/llvm-symbolizer/SymbolizationContext.h
  tools/llvm-symbolizer/SymbolizationContextDWARF.cpp
  tools/llvm-symbolizer/SymbolizationContextDWARF.h
  tools/llvm-symbolizer/SymbolizationContextPDB.cpp
  tools/llvm-symbolizer/SymbolizationContextPDB.h
  tools/llvm-symbolizer/SymbolizerOptions.h
  tools/llvm-symbolizer/llvm-symbolizer.cpp

EMAIL PREFERENCES
  http://reviews.llvm.org/settings/panel/emailpreferences/
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