[PowerPC] Fixed missing change flag of emitRLDICWhenLoweringJumpTables

PPCMIPeephole::emitRLDICWhenLoweringJumpTables should return a bool
value to indicate optimization is conducted or not.

Differential Revision: https://reviews.llvm.org/D63801

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@364383 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed