The following makes -ffast-math explicit.

	* gcc.dg/vect/vect.exp: Remove special-casing of tests
	named fast-math-*
	* gcc.dg/vect/fast-math-bb-slp-call-1.c: Add dg-additional-options
	-ffast-math.
	* gcc.dg/vect/fast-math-bb-slp-call-2.c: Likewise.
	* gcc.dg/vect/fast-math-bb-slp-call-3.c: Likewise.
	* gcc.dg/vect/fast-math-ifcvt-1.c: Likewise.
	* gcc.dg/vect/fast-math-pr35982.c: Likewise.
	* gcc.dg/vect/fast-math-pr43074.c: Likewise.
	* gcc.dg/vect/fast-math-pr44152.c: Likewise.
	* gcc.dg/vect/fast-math-pr55281.c: Likewise.
	* gcc.dg/vect/fast-math-slp-27.c: Likewise.
	* gcc.dg/vect/fast-math-slp-38.c: Likewise.
	* gcc.dg/vect/fast-math-vect-call-1.c: Likewise.
	* gcc.dg/vect/fast-math-vect-call-2.c: Likewise.
	* gcc.dg/vect/fast-math-vect-complex-3.c: Likewise.
	* gcc.dg/vect/fast-math-vect-outer-7.c: Likewise.
	* gcc.dg/vect/fast-math-vect-pow-1.c: Likewise.
	* gcc.dg/vect/fast-math-vect-pow-2.c: Likewise.
	* gcc.dg/vect/fast-math-vect-pr25911.c: Likewise.
	* gcc.dg/vect/fast-math-vect-pr29925.c: Likewise.
	* gcc.dg/vect/fast-math-vect-reduc-5.c: Likewise.
	* gcc.dg/vect/fast-math-vect-reduc-7.c: Likewise.
	* gcc.dg/vect/fast-math-vect-reduc-8.c: Likewise.
	* gcc.dg/vect/fast-math-vect-reduc-9.c: Likewise.
	* gcc.dg/vect/complex/fast-math-bb-slp-complex-add-double.c: Likewise.
	* gcc.dg/vect/complex/fast-math-bb-slp-complex-add-float.c: Likewise.
	* gcc.dg/vect/complex/fast-math-bb-slp-complex-add-half-float.c:
	Likewise.
	* gcc.dg/vect/complex/fast-math-bb-slp-complex-add-pattern-double.c:
	Likewise.
	* gcc.dg/vect/complex/fast-math-bb-slp-complex-add-pattern-float.c:
	Likewise.
	* gcc.dg/vect/complex/fast-math-bb-slp-complex-add-pattern-half-float.c:
	Likewise.
	* gcc.dg/vect/complex/fast-math-bb-slp-complex-mla-double.c: Likewise.
	* gcc.dg/vect/complex/fast-math-bb-slp-complex-mla-float.c: Likewise.
	* gcc.dg/vect/complex/fast-math-bb-slp-complex-mla-half-float.c:
	Likewise.
	* gcc.dg/vect/complex/fast-math-bb-slp-complex-mls-double.c: Likewise.
	* gcc.dg/vect/complex/fast-math-bb-slp-complex-mls-float.c: Likewise.
	* gcc.dg/vect/complex/fast-math-bb-slp-complex-mls-half-float.c:
	Likewise.
	* gcc.dg/vect/complex/fast-math-bb-slp-complex-mul-double.c: Likewise.
	* gcc.dg/vect/complex/fast-math-bb-slp-complex-mul-float.c: Likewise.
	* gcc.dg/vect/complex/fast-math-bb-slp-complex-mul-half-float.c:
	Likewise.
	* gcc.dg/vect/complex/fast-math-complex-add-double.c: Likewise.
	* gcc.dg/vect/complex/fast-math-complex-add-float.c: Likewise.
	* gcc.dg/vect/complex/fast-math-complex-add-half-float.c: Likewise.
	* gcc.dg/vect/complex/fast-math-complex-add-pattern-double.c:
	Likewise.
	* gcc.dg/vect/complex/fast-math-complex-add-pattern-float.c: Likewise.
	* gcc.dg/vect/complex/fast-math-complex-add-pattern-half-float.c:
	Likewise.
	* gcc.dg/vect/complex/fast-math-complex-mla-double.c: Likewise.
	* gcc.dg/vect/complex/fast-math-complex-mla-float.c: Likewise.
	* gcc.dg/vect/complex/fast-math-complex-mla-half-float.c: Likewise.
	* gcc.dg/vect/complex/fast-math-complex-mls-double.c: Likewise.
	* gcc.dg/vect/complex/fast-math-complex-mls-float.c: Likewise.
	* gcc.dg/vect/complex/fast-math-complex-mls-half-float.c: Likewise.
	* gcc.dg/vect/complex/fast-math-complex-mul-double.c: Likewise.
	* gcc.dg/vect/complex/fast-math-complex-mul-float.c: Likewise.
	* gcc.dg/vect/complex/fast-math-complex-mul-half-float.c: Likewise.