[compiler-rt] Fix 64-bits exception handlers in ASAN 64-bits runtime

Summary:
This is adding the appropriate suport for exception handling for
64-bits ASAN on windows.

Reviewers: rnk

Subscribers: kubabrecka, llvm-commits, wang0109, chrisha

Differential Revision: https://reviews.llvm.org/D22395

llvm-svn: 275585