Use WinEHPrepare to outline SEH finally blocks

No outlining is necessary for SEH catch blocks. Use the blockaddr of the
handler in place of the usual outlined function.

Reviewers: majnemer, andrew.w.kaylor

Differential Revision: http://reviews.llvm.org/D8370

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@232664 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed