[PATCH 1/2] Libsanitizer merge from upstream r253555.

[Maxim Ostapenko]

This is the library merge itself. I've also applied 3 GCC specific 
patches here (I don't post them separately to avoid polluting ChangeLog):

* Patch for SPARC by David S. Miller 
(https://gcc.gnu.org/ml/gcc-patches/2015-10/msg01855.html).
* Disable ODR violation detection 
(https://gcc.gnu.org/ml/gcc-patches/2015-10/msg01856.html).
* Adjust the fix for https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61771 
to extract the last PC from the stack frame if no valid FP is available 
for ARM (https://gcc.gnu.org/ml/gcc-patches/2015-10/msg01857.html).

-Maxim
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