PR target/37168
	* config/rs6000/rs6000-protos.h (const_vector_elt_as_int): Add
	prototype.
	* config/rs6000/rs6000.c (const_vector_elt_as_int): No longer static.
	* config/rs6000/altivec.md (easy_vector_constant_add_self splitter):
	Also split V4SFmode.
	* config/rs6000/predicates.md (easy_vector_constant_add_self): Handle
	vector float modes.

	* gcc.target/powerpc/pr37168.c: New test.

From-SVN: r139828