This reverts commit 36a6eb7d12a9f827bf3d5d4e5fdc68b8a62807b2. [MemCpyOpt] check that load/store and dest/src alloca are all in the same bb Differential Revision: https://reviews.llvm.org/D153453 Co-authored-by: serge-sans-paille <sguelton@mozilla.com>