[APX EGPR] Handle legacy insns that only support GPR16 (3/5)

Disable EGPR usage for below legacy insns in opcode map2/3 that have vex
but no evex counterpart.

insn list:
1. phminposuw/vphminposuw
2. ptest/vptest
3. roundps/vroundps, roundpd/vroundpd,
   roundss/vroundss, roundsd/vroundsd
4. pcmpestri/vpcmpestri, pcmpestrm/vpcmpestrm
5. pcmpistri/vpcmpistri, pcmpistrm/vpcmpistrm
6. aesimc/vaesimc, aeskeygenassist/vaeskeygenassist

gcc/ChangeLog:

	* config/i386/i386-protos.h (x86_evex_reg_mentioned_p): New
	prototype.
	* config/i386/i386.cc (x86_evex_reg_mentioned_p): New
	function.
	* config/i386/i386.md (sse4_1_round<mode>2): Set attr gpr32 0
	and constraint jm to all non-evex alternatives, adjust
	alternative outputs if evex reg is mentioned.
	* config/i386/sse.md (<sse4_1>_ptest<mode>): Set attr gpr32 0
	and constraint jm/ja to all non-evex alternatives.
	(ptesttf2): Likewise.
	(<sse4_1>_round<ssemodesuffix><avxsizesuffix): Likewise.
	(sse4_1_round<ssescalarmodesuffix>): Likewise.
	(sse4_2_pcmpestri): Likewise.
	(sse4_2_pcmpestrm): Likewise.
	(sse4_2_pcmpestr_cconly): Likewise.
	(sse4_2_pcmpistr): Likewise.
	(sse4_2_pcmpistri): Likewise.
	(sse4_2_pcmpistrm): Likewise.
	(sse4_2_pcmpistr_cconly): Likewise.
	(aesimc): Likewise.
	(aeskeygenassist): Likewise.

gcc/testsuite/ChangeLog:

	* gcc.target/i386/apx-legacy-insn-check-norex2.c: Add intrinsic
	tests.

Co-authored-by: Hongyu Wang <hongyu.wang@intel.com>
Co-authored-by: Hongtao Liu <hongtao.liu@intel.com>