Allow truncated and extend memory operations in Store Merge. NFCI.

As all store merges checks are based on the memory operation
performed, allow use of truncated stores and extended loads as valid
input candidates for merging.

Relanding after fixing selection between truncated and normal store.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@305701 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed