add the `pext` and `pdep` intrinsics #7831

Job	Run time
build (ubuntu-latest, x86_64-unknown-linux-gnu)	23m 8s
build (macos-14, aarch64-apple-darwin)	19m 12s
style checks	1m 58s
build (windows-latest, i686-pc-windows-msvc)	2m 26s
cronjob failure notification	0s
bors build finished	0s
bors build finished	0s
	46m 44s

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