rs6000: Change mode and insn condition for scalar insert exp instruction

rs6000: Change mode and insn condition for scalar insert exp instruction

gcc/
	* config/rs6000/rs6000-builtins.def
	(__builtin_vsx_scalar_insert_exp): Replace bif-pattern from xsiexpdp
	to xsiexpdp_di.
	(__builtin_vsx_scalar_insert_exp_dp): Replace bif-pattern from
	xsiexpdpf to xsiexpdpf_di.
	* config/rs6000/vsx.md (xsiexpdp): Rename to...
	(xsiexpdp_<mode>): ..., set the mode of second operand to GPR and
	replace TARGET_64BIT with TARGET_POWERPC64.
	(xsiexpdpf): Rename to...
	(xsiexpdpf_<mode>): ..., set the mode of second operand to GPR and
	replace TARGET_64BIT with TARGET_POWERPC64.

gcc/testsuite/
	* gcc.target/powerpc/bfp/scalar-insert-exp-0.c: Replace lp64 check
	with has_arch_ppc64.
	* gcc.target/powerpc/bfp/scalar-insert-exp-1.c: Likewise.
	* gcc.target/powerpc/bfp/scalar-insert-exp-12.c: Likewise.
	* gcc.target/powerpc/bfp/scalar-insert-exp-13.c: Likewise.
	* gcc.target/powerpc/bfp/scalar-insert-exp-3.c: Likewise.
	* gcc.target/powerpc/bfp/scalar-insert-exp-4.c: Likewise.