Remove naked_functions feature usage for x86 (#722) #4377

Job	Run time
Rustfmt	11s
Check --no-default-features (nightly)	49s
Check (stable)	3m 25s
Check selected Tier 3 platforms (nightly)	2m 24s
Check (nightly)	3m 28s
Check nightly-only targets (nightly)	25s
Check (1.48)	7m 14s
Test (ubuntu)	29s
Test rustix_use_experimental_asm (powerpc64le-linux)	57s
Test (ubuntu-20.04)	32s
Test use-libc (ubuntu)	32s
Test use-libc (i686-linux)	56s
Test (i686-linux)	51s
Test use-libc (aarch64-linux)	1m 6s
Test use-libc (powerpc64le-linux)	1m 14s
Test (aarch64-linux)	53s
Test (powerpc64le-linux)	49s
Test use-libc (riscv64-linux)	1m 11s
Test (riscv64-linux)	48s
Test use-libc (arm-linux)	1m 14s
Test (s390x-linux)	1m 0s
Test (arm-linux)	1m 2s
Test (ubuntu-stable)	35s
Test (ubuntu-1.48)	1m 0s
Test (i686-linux-stable)	57s
Test (aarch64-linux-stable)	53s
Test (riscv64-linux-stable)	1m 0s
Test (s390x-linux-stable)	1m 1s
Test (powerpc64le-linux-stable)	50s
Test (arm-linux-stable)	1m 3s
Test (ubuntu-1.48)	1m 1s
Test (i686-linux-1.48)	1m 1s
Test (aarch64-linux-1.48)	52s
Test (riscv64-linux-1.48)	1m 1s
Test (s390x-linux-1.48)	49s
Test (powerpc64le-linux-1.48)	1m 2s
Test (arm-linux-1.48)	59s
Test (macos-latest)	42s
Test (macos-11)	1s
Test (windows)	43s
Test (windows-2019)	48s
	47m 48s

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