[coroutines] Improve suspend point simplification

Summary:
Enable suspend point simplification for cases where:
* coro.save and coro.suspend are in different basic blocks
* where there are intervening intrinsics

Reviewers: modocache, tks2103, lewissbaker

Reviewed By: modocache

Subscribers: EricWF, llvm-commits

Differential Revision: https://reviews.llvm.org/D55160

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@348897 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed