[SEH] [ARM64] Retrieve the frame pointer from SEH funclets

The Windows ARM64 runtime passes the establisher frame to funclets as the first
argument.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@351404 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed