[XCore] Add ISel pattern for LDWCP

Patch by Robert Lytton.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@185518 91177308-0d34-0410-b5e6-96231b3b80d8
[XCore] Whitespace fixes, no functionality change.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@185519 91177308-0d34-0410-b5e6-96231b3b80d8