Resynchronize isLoadFromStackSlot with LoadRegFromStackSlot (and stores) in PPCInstrInfo

These functions should have the same list of load/store instructions. Now that
all load/store forms have been normalized (to single instructions or pseudos)
they can be resynchronized.

Found by inspection, although hopefully this will improve optimization.  I've
also added some comments.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@178180 91177308-0d34-0410-b5e6-96231b3b80d8
[ms-inline asm] Add support of imm displacement before bracketed memory
expression.  Specifically, this syntax:

 ImmDisp [ BaseReg + Scale*IndexReg + Disp ] 

We don't currently support:

 ImmDisp [ Symbol ]

rdar://13518671


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@178186 91177308-0d34-0410-b5e6-96231b3b80d8