PEI: refactor replaceFrameIndices(MF) to call replaceFrameIndices(BB).

replaceFrameIndices(MF) will iterate over the BBs and call
replaceFrameIndices(BB). No functionality change.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@186141 91177308-0d34-0410-b5e6-96231b3b80d8