[Hexagon] Reapplying 224775 load words.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@224786 91177308-0d34-0410-b5e6-96231b3b80d8
[Hexagon] Adding doubleword load.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@224787 91177308-0d34-0410-b5e6-96231b3b80d8