Update for LLVM r177774

LLVM r177774 replaces setScavengingFrameIndex / getScavengingFrameIndex
by addScavengingFrameIndex / isScavengingFrameIndex /
getScavengingFrameIndices.
Update for LLVM r177774 which changes addInitialFrameState
Change getFrameMoves to return a const reference.

To add a frame now there is a dedicated addFrameMove which also takes
care of constructing the move itself (message copied from r181657).
Update for LLVM r181680
Remove non-exist addrparam suffix 'w' for ldr/str instruction.
Remove addFrameMove.

Now that we have good testing, remove addFrameMove and create cfi
instructions directly (Copy this message from r182052).