i386: Remove 256 bit rounding for AVX10.2 minmax and convert instructions

i386: Remove 256 bit rounding for AVX10.2 minmax and convert instructions

Since we will support 512 bit on both P-core and E-core, 256 bit
rounding is not that useful because we currently have rounding feature
directly on E-core now and no need to use 256-bit rounding as somehow
a workaround. This patch will remove those in AVX10.2 minmax and convert
intrins.

gcc/ChangeLog:

	* config/i386/avx10_2convertintrin.h: Remove rounding intrins.
	Use non-round builtins.
	* config/i386/avx10_2minmaxintrin.h: Ditto.
	* config/i386/i386-builtin.def (BDESC): Ditto.
	* config/i386/i386-builtin-types.def: Remove unused type.
	* config/i386/i386-expand.cc
	(ix86_expand_args_builtin): Ditto.
	(ix86_expand_round_builtin): Ditto.

gcc/testsuite/ChangeLog:

	* gcc.target/i386/avx-1.c: Remove rounding tests.
	* gcc.target/i386/avx10_2-convert-1.c: Ditto.
	* gcc.target/i386/avx10_2-minmax-1.c: Ditto.
	* gcc.target/i386/sse-13.c: Ditto.
	* gcc.target/i386/sse-14.c: Ditto.
	* gcc.target/i386/sse-22.c: Ditto.
	* gcc.target/i386/sse-23.c: Ditto.