re PR target/80833 (32-bit x86 causes store-forwarding stalls for int64_t -> xmm)

re PR target/80833 (32-bit x86 causes store-forwarding stalls for int64_t -> xmm)

	PR target/80833
	* config/i386/constraints.md (Yd): New constraint.
	(Ye): Ditto.
	* config/i386/i386.md (*movti_internal): Add (?r, Ye)
	and (?Yd, r) alternatives.  Update insn attributes.
	* config/i386/i386.md (*movti_internal): Add (?r, *Ye)
	and (?*Yd, r) alternatives.  Update insn attributes.
	(double-mode inter-unit splitters): Add new GR<->XMM splitters.

testsuite/ChangeLog:

	PR target/80833
	* gcc.target/i386/pr80833-1.c: New test.
	* gcc.target/i386/pr80833-2.c: Ditto.

From-SVN: r248691