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

[Zachary Turner]

There had been significant discussion about producing a Format agnostic
debug info interface, but we all kind of decided that it would be
impossible in the general case, or at the very least extremely difficult.
Most situations don't require consuming both types of debug info so we
decided it would be best to defer this kind of abstraction to the places
that needed it.

We might be able to move a few specific utility classes to a common level,
but I don't think it would work in the general case.

The context, session information, way that you make queries against the
debug info are fundamentally different.


http://reviews.llvm.org/D9111

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