i386: Introduce V2QImode vectorized logic [PR103861]

i386: Introduce V2QImode vectorized logic [PR103861]

Add V2QImode logic operations with SSE and GP registers and split
them to V4QImode SSE instructions or SImode GP instructions.

The patch also fixes PR target/103900.

2022-01-04  Uroš Bizjak  <ubizjak@gmail.com>

gcc/ChangeLog:

	PR target/103861
	* config/i386/mmx.md (one_cmplv2qi3): New insn pattern.
	(one_cmplv2qi3 splitters): New post-reload splitters.
	(*andnotv2qi3): New insn pattern.
	(andnotv2qi3 splitters): New post-reload splitters.
	(<any_logic:code>v2qi3): New insn pattern.
	(<any_logic:insn>v2qi3 splitters): New post-reload splitters.

gcc/testsuite/ChangeLog:

	PR target/103861
	* gcc.target/i386/warn-vect-op-2.c: Adjust warnings.
	* gcc.target/i386/pr103900.c: New test.