Implement `llvm.x86.sse41.*` intrinsics #5945

Job	Run time
build (ubuntu-latest, x86_64-unknown-linux-gnu)	33m 43s
style checks	1m 57s
build (macos-latest, x86_64-apple-darwin)	15m 39s
build (windows-latest, i686-pc-windows-msvc)	42m 55s
bors build finished	0s
cronjob failure notification	0s
bors build finished	0s
	1h 34m 14s

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