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[sanitizer] Stop unwinding the stack when a close-to-zero PC is found
On OS X, we often get stack trace in a report that ends with a 0x0 frame. To get rid of it, let's trim the stack trace when we find a close-to-zero value, which is obviously not a valid PC. Differential Revision: http://reviews.llvm.org/D14656 llvm-svn: 273886
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