Backport patches to 0.35 #3442

Job	Run time
Check nightly-only targets (nightly)	32s
Check selected Tier 3 platforms (nightly)	37s
Check (stable)	1m 48s
Check --no-default-features (nightly)	24s
Rustfmt	14s
Check (nightly)	1m 38s
Test (ubuntu)	1m 4s
Test (i686-linux)	1m 24s
Check (1.48)	1m 56s
Test use-libc (ubuntu)	48s
Test use-libc (i686-linux)	1m 3s
Test (aarch64-linux)	1m 28s
Test (powerpc64le-linux)	1m 28s
Test (s390x-linux)	1m 29s
Test rustix_use_experimental_asm (powerpc64le-linux)	3m 1s
Test use-libc (aarch64-linux)	59s
Test (arm-linux)	1m 27s
Test use-libc (powerpc64le-linux)	51s
Test use-libc (arm-linux)	1m 4s
Test (ubuntu-stable)	1m 5s
Test (i686-linux-stable)	1m 27s
Test (aarch64-linux-stable)	1m 28s
Test (s390x-linux-stable)	1m 27s
Test (powerpc64le-linux-stable)	1m 27s
Test (arm-linux-stable)	1m 27s
Test (macos-latest)	1m 7s
Test (macos-10.15)	1s
Test (windows)	1m 16s
Test (windows-2019)	1m 14s
	35m 14s

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