Optimize vpexpand* to mask mov when mask have all ones in it's lower part (including...

Optimize vpexpand* to mask mov when mask have all ones in it's lower part (including 0 and -1).

gcc/ChangeLog:

	PR target/100267
	* config/i386/i386-builtin.def (BDESC): Adjust builtin name.
	* config/i386/sse.md (<avx512>_expand<mode>_mask): Rename to ..
	(expand<mode>_mask): this ..
	(*expand<mode>_mask): New pre_reload splitter to transform
	v{,p}expand* to vmov* when mask is zero, all ones, or has all
	ones in it's lower part, otherwise still generate
	v{,p}expand*.

gcc/testsuite/ChangeLog:

	PR target/100267
	* gcc.target/i386/avx512bw-pr100267-1.c: New test.
	* gcc.target/i386/avx512bw-pr100267-b-2.c: New test.
	* gcc.target/i386/avx512bw-pr100267-d-2.c: New test.
	* gcc.target/i386/avx512bw-pr100267-q-2.c: New test.
	* gcc.target/i386/avx512bw-pr100267-w-2.c: New test.
	* gcc.target/i386/avx512f-pr100267-1.c: New test.
	* gcc.target/i386/avx512f-pr100267-pd-2.c: New test.
	* gcc.target/i386/avx512f-pr100267-ps-2.c: New test.
	* gcc.target/i386/avx512vl-pr100267-1.c: New test.
	* gcc.target/i386/avx512vl-pr100267-pd-2.c: New test.
	* gcc.target/i386/avx512vl-pr100267-ps-2.c: New test.
	* gcc.target/i386/avx512vlbw-pr100267-1.c: New test.
	* gcc.target/i386/avx512vlbw-pr100267-b-2.c: New test.
	* gcc.target/i386/avx512vlbw-pr100267-d-2.c: New test.
	* gcc.target/i386/avx512vlbw-pr100267-q-2.c: New test.
	* gcc.target/i386/avx512vlbw-pr100267-w-2.c: New test.