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By default ASan calls a versioned function
`__asan_version_mismatch_check_vXXX` from the ASan module constructor to
check that the compiler ABI version and runtime ABI version are
compatible. This ensures that we get a predictable linker error instead
of hard-to-debug runtime errors.
Sometimes, however, we want to skip this safety guard. This new command
line option allows us to do just that.
rdar://47891956
Reviewed By: kubamracek
Differential Revision: https://reviews.llvm.org/D66826
llvm-svn: 370258
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