* aarch64.md (float<GPI:mode><GPF:mode>2): Remove.
(floatuns<GPI:mode><GPF:mode>2): Remove.
(<optab><fcvt_target><GPF:mode>2): New pattern for equal width float
and floatuns conversions.
(<optab><fcvt_iesize><GPF:mode>2): New pattern for inequal width float
and floatuns conversions.
* iterators.md (fcvt_target, FCVT_TARGET): Support SF and DF modes.
(w1,w2): New mode attributes for inequal width conversions.