(cherry picked from commit 20363f4)

(cherry picked from commit c4e61fa)

(cherry picked from commit 8f2af7e)

(cherry picked from commit cfb6afa)

(cherry picked from commit 6724f99)

… more const trait things in libcore

(cherry picked from commit 16f8396)

Commit 8378487 from #114611 changed the location of an obligation
deduplication step in `opt_normalize_projection_type`. This meant that
deduplication stopped happening on one path where it was still
necessary, causing a couple of drastic performance regressions.

This commit moves the deduplication back to the old location. The good
news is that #114611 had four commits and 8378487 was of minimal
importance, so the perf benefits from that PR remain.

Fixes #116780, #116797.

(cherry picked from commit 91f2fbc)

(cherry picked from commit d0b99e3)

(cherry picked from commit ab22470)

(cherry picked from commit bcdd3d7)

(cherry picked from commit a1e274f)

[beta-1.74] Update cargo

1 commits in 22a976c6fb1bef45abcf182b4c7def87ad8b4a4d..ecb9851afd3095e988daaa35a48bc7f3cb748e04
2023-10-12 00:06:40 +0000 to 2023-10-18 20:42:16 +0000
- [beta-1.74.0] Partial-version spec support (rust-lang/cargo#12847)

r? ghost

[beta] backports and stage0 bump

- Bump stage0 to released stable compiler
- Hide host effect params from docs #116670
- Fix a performance regression in obligation deduplication. #116826
- Make `#[repr(Rust)]` and `#[repr(C)]` incompatible with one another #116829
- Update to LLVM 17.0.3 #116840
- Disable effects in libcore again #116856
- revert rust-lang/rust#114586 #116879

r? cuviper

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