re PR target/49621 (ICE in trunc_int_for_mode, at explow.c:57)

re PR target/49621 (ICE in trunc_int_for_mode, at explow.c:57)

	PR target/49621
	* config/rs6000/rs6000.c (rs6000_emit_vector_cond_expr): Use
	CONST0_RTX (dest_mode) instead of const0_rtx as second operand
	of NE.
	* config/rs6000/vector.md (vector_select_<mode>,
	vector_select_<mode>_uns): Change second operand of NE to
	CONST0_RTX (<MODE>mode) instead of const0_rtx.
	* config/rs6000/altivec.md (*altivec_vsel<mode>,
	*altivec_vsel<mode>_uns): Expect second operand of NE to be
	zero_constant of the corresponding vector mode.
	* config/rs6000/vsx.md (*vsx_xxsel<mode>, *vsx_xxsel<mode>_uns):
	Likewise.

	* gcc.target/powerpc/altivec-34.c: New test.

From-SVN: r176063