Add `llvm.x86.vcvtps2ph.128` #4288

Job	Run time
rustfmt	14s
bench	7m 7s
test_llvm	3m 58s
dist (ubuntu-24.04-arm, aarch64-unknown-linux-gnu)	1m 36s
test (ubuntu-latest, s390x-unknown-linux-gnu, gcc-s390x-linux-gnu qemu-user)	4m 36s
dist (macos-15-intel, x86_64-apple-darwin)	3m 3s
test (ubuntu-latest, x86_64-unknown-linux-gnu)	12m 8s
test (ubuntu-latest, riscv64gc-unknown-linux-gnu, gcc-riscv64-linux-gnu qemu-user)	4m 8s
dist (windows-latest, x86_64-pc-windows-gnu)	2m 53s
test (windows-latest, x86_64-pc-windows-msvc)	18m 38s
test (windows-latest, x86_64-pc-windows-gnu)	22m 22s
test (macos-latest, aarch64-apple-darwin)	12m 37s
dist (windows-latest, x86_64-pc-windows-msvc)	2m 12s
dist (macos-latest, aarch64-apple-darwin)	2m 11s
test (ubuntu-24.04-arm, aarch64-unknown-linux-gnu)	9m 32s
test (macos-15-intel, x86_64-apple-darwin)	23m 28s
dist (ubuntu-22.04, x86_64-unknown-linux-gnu)	1m 42s
release	0s
	2h 12m 25s

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