[AArch64] [Windows] Trap after noreturn calls.

Like the comment says, this isn't the most efficient fix in terms of
codesize, but it works.

Differential Revision: https://reviews.llvm.org/D54129



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@346358 91177308-0d34-0410-b5e6-96231b3b80d8