People keep hitting on spurious failures in malloc/free routines when using sanitizers
with shared libraries dlopened with RTLD_DEEPBIND (see https://github.com/google/sanitizers/issues/611 for details).
Let's check for this flag and bail out with warning message instead of failing in random places.
Differential Revision: https://reviews.llvm.org/D30504
llvm-svn: 297370
Maxim Ostapenko