Add an "original alignment" field to load and store nodes. This enables the

Add an "original alignment" field to load and store nodes.  This enables the
DAG Combiner to disambiguate chains for loads and stores of types which are
 broken up by the Legalizer into smaller pieces.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@81813 91177308-0d34-0410-b5e6-96231b3b80d8