Comment 1 for bug 1708630

I tried cherry picking these onto 4.13, "perf vendor events powerpc: remove suffix in mapfile" I could do with a little backporting but "perf vendor events powerpc: Update POWER9 events" is trying to update files which don't exist in 4.13. So we're obviously missing some prerequisites, can you provide a full list of commits needed for 4.12/4.13?