For invalid pointers passed to free_common check whether they are actually skewed to hold an additional CFAllocatorRef.
If so, fix the pointer and pass it to asan_free.

See http://code.google.com/p/address-sanitizer/issues/detail?id=70 for more background.


git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@162839 91177308-0d34-0410-b5e6-96231b3b80d8
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