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Add `no_std` support for Web #144

Job	Run time
Cross (sparcv9-sun-solaris)	26s
Linux x32 (x86_64-unknown-linux-gnux32)	25s
Cross (x86_64-unknown-illumos)	24s
Apple Other	49s
Tier 2 (x86_64-unknown-fuchsia)	6s
Tier 3 (aarch64-kmc-solid_asp3)	21s
Tier 2 (x86_64-unknown-redox)	9s
RDRAND (x86_64-unknown-uefi)	21s
Tier 3 (aarch64-unknown-nto-qnx710)	21s
Tier 2 (x86_64-fortanix-unknown-sgx)	11s
RDRAND (x86_64-unknown-l4re-uclibc)	23s
Tier 3 (armv6k-nintendo-3ds)	20s
Tier 3 (armv7-sony-vita-newlibeabihf)	20s
Tier 3 (i686-unknown-hurd-gnu)	26s
Tier 3 (x86_64-unknown-hermit)	30s
Web no_std	26s
Tier 3 (x86_64-wrs-vxworks)	25s
Web no_std with Atomics	25s
Web	31s
Tier 3 (x86_64-unknown-dragonfly)	21s
Web with Atomics	32s
Tier 3 (x86_64-unknown-haiku)	25s
WasmV1 no_std	25s
WasmV1 no_std with Atomics	29s
ESP-IDF	20s
No Atomics	7s
RNDR	12s
	10m 10s

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