i386: Optimize blsi followed by comparison [PR98567]

i386: Optimize blsi followed by comparison [PR98567]

The BLSI instruction sets SF and ZF based on the result and clears OF.
CF is set to something unrelated.

The following patch optimizes BLSI followed by comparison, so we don't need
to emit a TEST insn in between.

2021-01-07  Jakub Jelinek  <jakub@redhat.com>

	PR target/98567
	* config/i386/i386.md (*bmi_blsi_<mode>_cmp, *bmi_blsi_<mode>_ccno):
	New define_insn patterns.

	* gcc.target/i386/pr98567-1.c: New test.
	* gcc.target/i386/pr98567-2.c: New test.