Make TypeId const comparable

[oli-obk]

This should unblock stabilizing const TypeId::of and allow us to progress into any possible future we want to take TypeId to.

To achieve that TypeId now contains a &'static [u8; 16] which is the stable hash and a *const () which is actually just size_of<usize>() bytes of the stable hash for a quick check whether dereferencing the &'static [u8; 16] is worth it. See the documentation on TypeId's fields for details

cc @eddyb for their previous work on #95845 (which we still can do in the future if we want to get rid of the hash as the final thing that declares two TypeIds as equal).

• Tracking Issue for const fn type_id #77125

r? @RalfJung

[rustbot]

Some changes occurred to the intrinsics. Make sure the CTFE / Miri interpreter
gets adapted for the changes, if necessary.

cc @rust-lang/miri, @RalfJung, @oli-obk, @lcnr

Some changes occurred in compiler/rustc_codegen_cranelift

cc @bjorn3

Some changes occurred to the CTFE / Miri interpreter

cc @rust-lang/miri, @RalfJung, @oli-obk, @lcnr

Some changes occurred to the CTFE / Miri interpreter

cc @rust-lang/miri

Some changes occurred to the CTFE machinery

cc @RalfJung, @oli-obk, @lcnr

Some changes occurred in compiler/rustc_codegen_gcc

cc @antoyo, @GuillaumeGomez

[rust-log-analyzer]

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fmt: checked 6077 files
tidy check
Running eslint on rustdoc JS files
tidy: Skipping binary file check, read-only filesystem
##[error]tidy error: /checkout/compiler/rustc_const_eval/src/interpret/memory.rs:632: TODO is used for tasks that should be done before merging a PR; If you want to leave a message in the codebase use FIXME
removing old virtual environment
creating virtual environment at '/checkout/obj/build/venv' using 'python3.10' and 'venv'
creating virtual environment at '/checkout/obj/build/venv' using 'python3.10' and 'virtualenv'
Requirement already satisfied: pip in ./build/venv/lib/python3.10/site-packages (25.1.1)
linting python files
All checks passed!
checking python file formatting
28 files already formatted
checking C++ file formatting
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Build completed unsuccessfully in 0:01:21
  local time: Fri Jun 20 16:20:06 UTC 2025
  network time: Fri, 20 Jun 2025 16:20:06 GMT
##[error]Process completed with exit code 1.
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