Stabilize Wasm relaxed SIMD #1859

Job	Run time
Check Style	21s
Automatic intrinsic verification	40s
Build Documentation	28s
Build std_detect	1m 14s
Env Override	16s
Test (i686-unknown-linux-gnu)	1m 35s
Test (x86_64-unknown-linux-gnu)	1m 34s
Test (x86_64-unknown-linux-gnu-emulated)	1m 34s
Test (arm-unknown-linux-gnueabihf)	1m 37s
Test (armv7-unknown-linux-gnueabihf)	1m 37s
Test (aarch64-unknown-linux-gnu)	1m 36s
Test (riscv64gc-unknown-linux-gnu)	1m 35s
Test (powerpc64le-unknown-linux-gnu)	1m 36s
Test (s390x-unknown-linux-gnu)	1m 38s
Test (wasm32-wasi)	1m 18s
Test (i586-unknown-linux-gnu)	1m 37s
Test (nvptx64-nvidia-cuda)	47s
Test (thumbv6m-none-eabi)	19s
Test (thumbv7m-none-eabi)	21s
Test (thumbv7em-none-eabi)	17s
Test (thumbv7em-none-eabihf)	20s
Test (aarch64-apple-darwin)	1m 34s
Test (x86_64-pc-windows-msvc)	1m 30s
Test (i686-pc-windows-msvc)	1m 30s
Test (x86_64-apple-darwin, macos-11)	1m 31s
	28m 25s

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