[PATCH] [compiler-rt] Symbolizer refactoring: Link symbolizer tools into a fallback chain

[Kuba Brecka]

Part of http://reviews.llvm.org/D7827.  Although we currently always use only one (or zero) symbolizer tool from `POSIXSymbolizer`, let's prepare a "fallback chain", which will be useful in the planned atos- and dladdr-based symbolizers.

http://reviews.llvm.org/D8049

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

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