Update branch coalescing to be a PowerPC specific pass

Implementing this pass as a PowerPC specific pass.  Branch coalescing utilizes
the analyzeBranch method which currently does not include any implicit operands.
This is not an issue on PPC but must be handled on other targets.

Differential Revision : https: // reviews.llvm.org/D32776

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@311588 91177308-0d34-0410-b5e6-96231b3b80d8
11 files changed