vsx.md (first_match_index_<mode>): Calculate index using natural element order.

vsx.md (first_match_index_<mode>): Calculate index using natural element order.

gcc/ChangeLog:

2018-06-04  Carl Love  <cel@us.ibm.com>

	* gcc/config/rs6000/vsx.md (first_match_index_<mode>): Calculate index
	using natural element order.  Use gen_lshrsi3 instead of gen_ashrsi3
	as it is slightly cheaper.
	(first_match_or_eos_index_<mode>):
	Calculate index using natural element order.
	(first_match_index_<mode>):
	Calculate index using natural element order.
	(first_match_or_eos_index_<mode>):
	Calculate index using natural order.
	(define_insn vclzlsbb): Change to define_insn vclzlsbb_<mode>.
	for BE and LE modes.
	* gcc/config/rs6000/rs6000-c.c: Rename P9V_BUILTIN_VCLZLSBB,
	P9V_BUILTIN_VCLZLSBB_V16QI.
	* gcc/config/rs6000/rs6000-builtin.def: Make VCLZLSBB mode
	specific.

gcc/testsuite/ChangeLog:

2018-06-04  Carl Love  <cel@us.ibm.com>

	* gcc.target/powerpc/builtins-8-p9-runnable.c: Add additional
	debug print statements.  Fix a few formating issues.

From-SVN: r261255