Reduce some queries around associated items

[camsteffen]

No description provided.

[rustbot]

r? @petrochenkov

rustbot has assigned @petrochenkov.
They will have a look at your PR within the next two weeks and either review your PR or reassign to another reviewer.

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[rustbot]

Some changes occurred to the CTFE machinery

cc @RalfJung, @oli-obk, @lcnr

Some changes occurred to MIR optimizations

cc @rust-lang/wg-mir-opt

Some changes occurred to the CTFE / Miri interpreter

cc @rust-lang/miri

[petrochenkov]

@bors2 try @rust-timer queue

[rust-timer]

Awaiting bors try build completion.

@rustbot label: +S-waiting-on-perf

[rust-bors]

☀️ Try build successful (CI)
Build commit: 811ef38 (811ef38822ea064db8fdb0a434857b88b1a36cd3, parent: fce0e74720d199eb7839fdb51af35ac5226da178)

[rust-timer]

Queued 811ef38 with parent fce0e74, future comparison URL.
There are currently 2 preceding artifacts in the queue.
It will probably take at least ~2.8 hours until the benchmark run finishes.