[MemorySSA] Expose the verify as a debug option.

Summary: Expose VerifyMemorySSA as a debug option. If set, passes will call the MSSA->verifyMemorySSA() after calling into the updater's APIs when MemorySSA should be valid.

Reviewers: george.burgess.iv

Subscribers: sanjoy, jlebar, Prazek, llvm-commits

Differential Revision: https://reviews.llvm.org/D50749

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@339795 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed