Implement `llvm.x86.sse41.*` intrinsics #5963

Job	Run time
build (ubuntu-latest, x86_64-unknown-linux-gnu)	35m 41s
build (macos-latest, x86_64-apple-darwin)	14m 47s
style checks	2m 5s
build (windows-latest, i686-pc-windows-msvc)	25m 57s
cronjob failure notification	0s
bors build finished	0s
bors build finished	0s
	1h 18m 30s

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