Add `#[cfg_attr(miri, ignore)]` to tests of functions that cannot be supported by Miri #1850

Job	Run time
Check Style	18s
Automatic intrinsic verification	46s
Build Documentation	1m 19s
Test (i686-unknown-linux-gnu)	32s
Build std_detect	1m 42s
Test (x86_64-unknown-linux-gnu)	31s
Env Override	16s
Test (x86_64-unknown-linux-gnu-emulated)	32s
Test (arm-unknown-linux-gnueabihf)	17s
Test (armv7-unknown-linux-gnueabihf)	34s
Test (aarch64-unknown-linux-gnu)	19s
Test (riscv64gc-unknown-linux-gnu)	33s
Test (powerpc64le-unknown-linux-gnu)	32s
Test (s390x-unknown-linux-gnu)	32s
Test (wasm32-wasi)	31s
Test (i586-unknown-linux-gnu)	34s
Test (nvptx64-nvidia-cuda)	32s
Test (thumbv6m-none-eabi)	17s
Test (thumbv7m-none-eabi)	20s
Test (thumbv7em-none-eabi)	18s
Test (thumbv7em-none-eabihf)	17s
Test (aarch64-apple-darwin)	30s
Test (x86_64-pc-windows-msvc)	14s
Test (i686-pc-windows-msvc)	19s
Test (x86_64-apple-darwin, macos-11)	17s
	12m 52s

Provide feedback