ARM: Clean up copyPhysReg() a bit.

No functional change, just cleaning things up for readability.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@193138 91177308-0d34-0410-b5e6-96231b3b80d8
ARM: Thumb2 copy for GPRPair needs to use thumb instructions.

Use tMOVr instead of plain MOVr.

rdar://15193017

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@193139 91177308-0d34-0410-b5e6-96231b3b80d8