rs6000: Do not allow out of range immediate in vsplt[bhw] (PR86987)

rs6000: Do not allow out of range immediate in vsplt[bhw] (PR86987)

The original AltiVec manuals had the immediate lane number in the
splat instructions as a 5-bit number, but anything too big has no
defined meaning, and gas will choke on it too.  This patch disallows
it in the instruction patterns as well as in the builtins.  This
solves PR86987.

	PR target/86987
	* config/rs6000/altivec.md (altivec_vspltb): Use
	const_0_to_15_operand instead of u5bit_cint_operand.
	(*altivec_vspltb_internal): Ditto.
	(altivec_vspltb_direct): Ditto.
	(altivec_vsplth): Use const_0_to_7_operand instead of
	u5bit_cint_operand.
	(*altivec_vsplth_internal): Ditto.
	(altivec_vsplth_direct): Ditto.
	(altivec_vspltw): Use const_0_to_3_operand instead of
	u5bit_cint_operand.
	(*altivec_vspltw_internal): Ditto.
	(altivec_vspltw_direct): Ditto.
	(altivec_vspltsf): Ditto.
	(*altivec_vspltsf_internal): Ditto.
	* config/rs6000/rs6000.c (rs6000_expand_binop_builtin): Handle the
	various splats with the proper size immediate.  Reorder the various
	cases by ascending size of immediate, and put all such together.

From-SVN: r264584