[ASan/Win] Use the new function interception approach to handle function wrappers too; wrap strlen() in DLLs

Reviewed at http://reviews.llvm.org/D3871

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@209427 91177308-0d34-0410-b5e6-96231b3b80d8