commit back "GVN-hoist: fix store past load dependence analysis (PR30216, PR30499)"

This is with an extra change to avoid calling MemoryLocation::get() on a call instruction.

Differential Revision: https://reviews.llvm.org/D25542

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@284098 91177308-0d34-0410-b5e6-96231b3b80d8
5 files changed