[PATCH] [compiler-rt] Add AtosSymbolizer and DlAddrSymbolizer as fallbacks for OS X

[Kuba Brecka]

Updating the patch.  Extracted a `ChooseExternalSymbolizer` which selects one external symbolizer that will be used (I guess having multiple external symbolizers doesn't make sense).


http://reviews.llvm.org/D8285

Files:
  lib/sanitizer_common/sanitizer_symbolizer_posix_libcdep.cc
  test/asan/TestCases/Darwin/atos-symbolizer.cc
  test/asan/TestCases/Darwin/dyld-root-path.cc
  test/asan/TestCases/Darwin/sandbox-symbolizer.cc
  test/asan/TestCases/Darwin/suppressions-sandbox.cc

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