Do not query the HIR directly in opt_associated_item.

[cjgillot]

Papercut found by @Aaron1011.

[rust-highfive]

r? @oli-obk

(rust-highfive has picked a reviewer for you, use r? to override)

[jyn514]

Context: https://rust-lang.zulipchat.com/#narrow/stream/131828-t-compiler/topic/docs.2Ers.20compile.20times

[Aaron1011]

@bors try @rust-timer queue

[rust-timer]

Awaiting bors try build completion.

[bors]

⌛ Trying commit 21e1963 with merge 94ff5034a337d444f8bb2973062b60d542ff9061...

[bors]

☀️ Try build successful - checks-actions
Build commit: 94ff5034a337d444f8bb2973062b60d542ff9061 (94ff5034a337d444f8bb2973062b60d542ff9061)

[rust-timer]

Queued 94ff5034a337d444f8bb2973062b60d542ff9061 with parent 080ee6f, future comparison URL.

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

[rust-timer]

Finished benchmarking try commit (94ff5034a337d444f8bb2973062b60d542ff9061): comparison url.

Benchmarking this pull request likely means that it is perf-sensitive, so we're automatically marking it as not fit for rolling up. Please note that if the perf results are neutral, you should likely undo the rollup=never given below by specifying rollup- to bors.

Importantly, though, if the results of this run are non-neutral do not roll this PR up -- it will mask other regressions or improvements in the roll up.

@bors rollup=never
@rustbot label: +S-waiting-on-review -S-waiting-on-perf

[oli-obk]

@bors r+

[bors]

📌 Commit 21e1963 has been approved by oli-obk

[bors]

⌛ Testing commit 21e1963 with merge 6526e5c...

[bors]

☀️ Test successful - checks-actions
Approved by: oli-obk
Pushing 6526e5c to master...