[PATCH v2 2/6] Libsanitizer merge from upstream r250806 (was r249633).

[Maxim Ostapenko]

This patch introduces required compiler changes. Now, we don't version 
asan_init, we have a special __asan_version_mismatch_check_v[n] symbol 
for this. asan_stack_malloc_[n] doesn't take a local stack as a second 
parameter anymore, so don't pass it. Also, ubsan_instrument_float_cast 
was adjusted to pass source location for libubsan if it is possible.
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