This is a resubmission of r256336 which was reverted in r256361. The issue was the lack of the invariant check of the memset value in processLooMemSet().
The original message:
Move several checks into isLegalStores. Also, delineate between those stores that are memset-able and those that are memcpy-able.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@256783
91177308-0d34-0410-b5e6-
96231b3b80d8