[x86] Relax the check in areLoadsFromSameBasePtr

Check if the scale operand is identical (doesn't have to be 1) and
do not check the chaain operand.

Differential revision: https://reviews.llvm.org/D31833

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@299986 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed