APX: Emit nf variant for rotl splitter with mask [PR 119539]

APX: Emit nf variant for rotl splitter with mask [PR 119539]

For spiltter after *<rotate_insn><mode>3_mask it now splits the pattern
to *<rotate_insn><mode>3_mask with flag reg clobber, and it doesn't
generate nf variant of rotate. Directly emit nf pattern when
TARGET_APX_NF enabled in these define_insn_and_split.

gcc/ChangeLog:

	PR target/119539
	* config/i386/i386.md (*<insn><mode>3_mask): Emit NF variant of
	rotate when APX_NF enabled, and use force_lowpart_subreg.
	(*<insn><mode>3_mask_1): Likewise.

gcc/testsuite/ChangeLog:

	PR target/119539
	* gcc.target/i386/apx-nf-pr119539.c: New test.