Summary:
Add support for cleanupret, catchret, catchpad, cleanuppad and catchswitch and their associated accessors.
Test is modified from SimplifyCFG because it contains many diverse usages of these instructions.
Reviewers: whitequark, deadalnix, echristo
Reviewed By: echristo
Subscribers: llvm-commits, harlanhaskins
Differential Revision: https://reviews.llvm.org/D44496
llvm-svn: 328759