Add round_nimm_scalar_predicate and use xBm

Add round_nimm_scalar_predicate and use xBm

Add round_nimm_scalar_predicate for scalar SSE integer to floating point
conversions since round_nimm_predicate is for vector operand.

round_constraint can't be used on vector SSE patterns since it is mapped
to "vm".  The "xBm" constraint must be used in this case.

gcc/

	PR target/69171
	* config/i386/sse.md (<sse>_sqrt<mode>2<mask_name><round_name>):
	Use the "xBm" constraint.
	(float<sseintvecmodelower><mode>2<mask_name><round_name):
	Likewise.
	(sse_cvtsi2ss<round_name>): Use round_nimm_scalar_predicate.
	(sse_cvtsi2ssq<round_name>): Likewise.
	(sse_cvtss2si<round_name>): Likewise.
	(sse_cvtss2siq<round_name>): Likewise.
	(sse2_cvtsi2sdq<round_name>): Likewise.
	(sse2_cvtsd2si<round_name>): Likewise.
	(sse2_cvtsd2siq<round_name>): Likewise.
	* config/i386/subst.md (round_nimm_scalar_predicate): New
	predicate.

gcc/testsuite/

	PR target/69171
	* gcc.target/i386/pr69171-1.c: New test.
	* gcc.target/i386/pr69171-2.c: Likewise.
	* gcc.target/i386/pr69171-3.c: Likewise.
	* gcc.target/i386/pr69171-4.c: Likewise.
	* gcc.target/i386/pr69171-5.c: Likewise.
	* gcc.target/i386/pr69171-6.c: Likewise.

From-SVN: r232126