[PATCH kernel] powerpc/powernv: Fix clobbered MSR

[Benjamin Herrenschmidt]

On Thu, 2017-03-02 at 17:41 +1100, Alexey Kardashevskiy wrote:
> With CONFIG_DEBUG_INFO_SPLIT=y, the makefile adds "-gsplit-dwarf" which
> somehow makes the scripts/gcc-goto.sh test fail and not have
> CC_HAVE_ASM_GOTO defined so the alternative OPAL_BRANCH() is used

This needs to be fixed too though. That alternative path has much more
overhead accross the board. Losing "asm goto" because of a broken test
is nasty.

Cheers,
Ben.