[compiler-rt][asan|win] Fix ASAN exception handler missing import

Summary:
This patch is adding a missing ASAN API redirection from an instrumented DLL.
The bug was introduced here:
  https://reviews.llvm.org/D29463

This is causing this chromium bug:
  https://bugs.chromium.org/p/chromium/issues/detail?id=692580

Reviewers: rnk

Reviewed By: rnk

Subscribers: kubamracek, dberris, llvm-commits, chrisha, thakis

Differential Revision: https://reviews.llvm.org/D30001

llvm-svn: 295232