The upper bits of FIXUPIMMS{S,D} should come from src1 not dest.

The upper bits of FIXUPIMMS{S,D} should come from src1 not dest.

gcc/ChangeLog:

	PR target/101248
	* config/i386/sse.md
	(avx512f_sfixupimm<mode><sd_maskz_name><round_saeonly_name>):
	Refined to ..
	(avx512f_sfixupimm<mode><maskz_scalar_name><round_saeonly_name>):
	this.
	(avx512f_sfixupimm<mode>_mask<round_saeonly_name>"): Refined.
	* config/i386/subst.md (maskz_scalar): New define_subst.
	(maskz_scalar_name): New subst_attr.
	(maskz_scalar_op5): Ditto.
	(round_saeonly_maskz_scalar_op5): Ditto.
	(round_saeonly_maskz_scalar_operand5): Ditto.

gcc/testsuite/ChangeLog

	PR target/101248
	* gcc.target/i386/pr101248.c: New test.