PR target/42416
	* config/rs6000/rs6000.c (rs6000_override_options): On targets
	that support VSX, warn for -mno-altivec if vsx is not disabled,
	and disable vsx.
	* gcc.target/powerpc/warn-1.c: New test.
	* gcc.target/powerpc/warn-2.c: New test.

From-SVN: r155816