[WinEH] Fix establisher param reg in CLR funclets

Summary:
The CLR's personality routine passes the pointer to the establisher frame
in RCX, not RDX.

Reviewers: pgavlin, majnemer, rnk

Subscribers: llvm-commits

Differential Revision: http://reviews.llvm.org/D14343

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@252135 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed