Improve some tests #1834

Job	Run time
Check Style	21s
Env Override	20s
Build std_detect	1m 48s
Build Documentation	1m 25s
Test (i686-unknown-linux-gnu)	3m 22s
Automatic intrinsic verification	34s
Test (x86_64-unknown-linux-gnu)	6m 4s
Test (x86_64-unknown-linux-gnu-emulated)	11m 55s
Test (arm-unknown-linux-gnueabihf)	2m 33s
Test (armv7-unknown-linux-gnueabihf)	17m 45s
Test (aarch64-unknown-linux-gnu)	28m 37s
Test (riscv64gc-unknown-linux-gnu)	2m 24s
Test (powerpc64le-unknown-linux-gnu)	8m 47s
Test (s390x-unknown-linux-gnu)	2m 48s
Test (wasm32-wasi)	3m 21s
Test (i586-unknown-linux-gnu)	4m 1s
Test (nvptx64-nvidia-cuda)	46s
Test (thumbv6m-none-eabi)	17s
Test (thumbv7m-none-eabi)	20s
Test (thumbv7em-none-eabi)	22s
Test (thumbv7em-none-eabihf)	23s
Test (aarch64-apple-darwin)	2m 19s
Test (x86_64-pc-windows-msvc)	9m 30s
Test (i686-pc-windows-msvc)	5m 53s
Test (x86_64-apple-darwin, macos-11)	8m 15s
	2h 4m 10s

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