Disable the "PrettyStackTracePrinter" from LLVM as it seems to overwrite previously installed signal handlers
Disable the "PrettyStackTracePrinter" from LLVM as it seems to overwrite previously installed signal handlers

git-svn-id: 93cebb81a0f5cc00f31a7ad40d16024532691b70@815 a3683778-fedd-11de-87c3-653bb6514e15

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