Stabilize const_intrinsic_copy

[usbalbin]

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r? @joshtriplett

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[rust-log-analyzer]

The job mingw-check failed! Check out the build log: (web) (plain)

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   |
10 | #![feature(const_intrinsic_copy)]
   |            ^^^^^^^^^^^^^^^^^^^^
   |
   = note: `-D stable-features` implied by `-D warnings`
error: could not compile `alloc` due to previous error
warning: build failed, waiting for other jobs to finish...
Build completed unsuccessfully in 0:01:50

[JohnTitor]

Thanks for the PR but it's a duplicate of #97276, closing not to make a confusion.