[PATCH v2 4/6] Libsanitizer merge from upstream r250806 (was r249633).

[Maxim Ostapenko]

This is a reapplied Jakub's patch for disabling ODR violation detection. 
The patch was preapproved here: 
(https://gcc.gnu.org/ml/gcc-patches/2015-10/msg01215.html).
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