[asan] Revert r221882.

This code is not part of ASan runtime (as it may be linked into a different
DSO), and thus can not call non-exported functions.


git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@221986 91177308-0d34-0410-b5e6-96231b3b80d8