Attached is a patch that eliminates the unused stack frame
allocated by gcc 5 with -pg -mprofile-kernel on powepc64le
and brings the code into parity with previous gcc versions.

The patch doesn't do anything to change the emitted code
when -mprofile-kernel is used without -pg. Since the former
option isn't fully documented (as noted in pr 65372) it's
unclear what effect it should be expected to have without
-pg.

The patch was tested on {powerpc64,powerpc64le}-linux.

Martin