[PATCH] [compiler-rt] Symbolizer refactoring: Make LibbacktraceSymbolizer adopt the SymbolizerTool interface

[Kuba Brecka]

Part of http://reviews.llvm.org/D7827.  This converts `LibbacktraceSymbolizer` to adopt the new `SymbolizerTool` interface that all symbolizers will (eventually) use.

http://reviews.llvm.org/D7971

Files:
  lib/sanitizer_common/sanitizer_symbolizer_libbacktrace.cc
  lib/sanitizer_common/sanitizer_symbolizer_libbacktrace.h
  lib/sanitizer_common/sanitizer_symbolizer_posix_libcdep.cc

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