[RegisterCoalescer] Moving the RegisterCoalescer subtarget hook onto the TargetRegisterInfo instead of the TargetSubtargetInfo.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@213188 91177308-0d34-0410-b5e6-96231b3b80d8
Utilize CastInst::CreatePointerBitCastOrAddrSpaceCast here.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@213189 91177308-0d34-0410-b5e6-96231b3b80d8
Remove Atom references in description.

Any CPU can run this pass.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@213190 91177308-0d34-0410-b5e6-96231b3b80d8