[PATCH] [compiler-rt] Symbolizer refactoring: Merge common parts of POSIXSymbolizer and WinSymbolizer

[Kuba Brecka]

Part of http://reviews.llvm.org/D7827.  Moves most of the implementation from `POSIXSymbolizer` to the superclass, `Symbolizer`, and reuses that in `WinSymbolizer`.  Removes `Symbolizer::Disable()`, because we're not using it anyway.

Note that the public methods of `Symbolizer` lock the `mu_` mutex, so both the tool's methods *and* the platform-specific virtual methods of `Symbolizer` (such as `FindModuleNameAndOffsetForAddress`) are synchronized.

http://reviews.llvm.org/D8105

Files:
  lib/sanitizer_common/sanitizer_symbolizer.cc
  lib/sanitizer_common/sanitizer_symbolizer.h
  lib/sanitizer_common/sanitizer_symbolizer_internal.h
  lib/sanitizer_common/sanitizer_symbolizer_libcdep.cc
  lib/sanitizer_common/sanitizer_symbolizer_posix_libcdep.cc
  lib/sanitizer_common/sanitizer_symbolizer_win.cc

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