Revert "[DAG] Allow truncated and extend memory operations in Store Merge. NFCI."

This reverts commit r305468, as it caused PR33475.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@305527 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed