[PATCH] [ASan] Allow the users of SymbolizationLoop to make use of the -dsym_hint option in llvm-symbolizer

[Alexander Potapenko]

Hi earthdok,

Let the users of SymbolizationLoop define a function that produces the list of .dSYM hints (possible path to the .dSYM bundle) for the given binary.
Because the hints can't be added to an existing llvm-symbolizer process, we spawn a new symbolizer process ones each time a new hint appears.
Those can only appear for binaries that we haven't seen before.

http://reviews.llvm.org/D6310

Files:
  projects/compiler-rt/lib/asan/scripts/asan_symbolize.py
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