There are quite some old testcases with powerpc- triple,
we should add this triple support so that we can update them with script.
Appears identical to powerpc64{,le}, ppc32.
Regenerate one test that is being affected by upcoming patch.
Haven't seen assembly generated for AIX 32 (powerpc-ibm-aix-xcoff),
but we should be able to use the same one as well,
or else, we can fix it later when AIX 32 asm support lands.