[PATCH] Replace PrintStackTrace(FILE*) with PrintStackTrace(raw_ostream&)

[Zachary Turner]

Actually even better, it was *already* using llvm::errs() except for the
call to this function, where it passed in llvm::errs().  So this is
actually an improvement to the function, even if only a theoretical
improvement.


http://reviews.llvm.org/D8074

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