Don't avoid cfi instructions on the bg/p.

The integrated assembler now works for ppc. Since this was the last use of the
bg/p predicate and Hal says that it is now dead, drop the predicate too.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@203269 91177308-0d34-0410-b5e6-96231b3b80d8