[PR80582][X86] Add missing __mm256_set[r] intrinsics

[Koval, Julia]

Hi,

This patch implements missing intrinsics:
_mm256_set_m128
_mm256_set_m128d
_mm256_set_m128i
_mm256_setr_m128
_mm256_setr_m128d
_mm256_setr_m128i

gcc/
	* config/i386/avxintrin.h (_mm256_set_m128, _mm256_set_m128d,
	_mm256_set_m128i, _mm256_setr_m128, _mm256_setr_m128d,
	_mm256_setr_m128i): New intrinsics.

gcc/testsuite/
	* gcc.target/i386/avx-vinsertf128-256-1: Test new intrinsics.
	* gcc.target/i386/avx-vinsertf128-256-2: Ditto.
	* gcc.target/i386/avx-vinsertf128-256-3: Ditto.

Ok for trunk?

Thanks,
Julia
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