clippy::perf fixes

[matthiaskrgr]

No description provided.

[rust-highfive]

r? @jackh726

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[klensy]

Perhaps this (and lower) sort's need to be stable?

[matthiaskrgr]

We are sorting primitives (usizes) here, so it does not matter if we have 1, 1, 1 or 1, 1, 1 :)

[Mark-Simulacrum]

@bors try @rust-timer queue

[rust-timer]

Awaiting bors try build completion.

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

[bors]

⌛ Trying commit a953574 with merge 9474e103eafbe1d5f98d8298b44dd59afa1f37f9...

[bors]

☀️ Try build successful - checks-actions
Build commit: 9474e103eafbe1d5f98d8298b44dd59afa1f37f9 (9474e103eafbe1d5f98d8298b44dd59afa1f37f9)

[rust-timer]

Queued 9474e103eafbe1d5f98d8298b44dd59afa1f37f9 with parent d08460e, future comparison URL.

[rust-timer]

Finished benchmarking try commit (9474e103eafbe1d5f98d8298b44dd59afa1f37f9): comparison url.

Summary: This benchmark run did not return any significant changes.

If you disagree with this performance assessment, please file an issue in rust-lang/rustc-perf.

Benchmarking this pull request likely means that it is perf-sensitive, so we're automatically marking it as not fit for rolling up.

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

[jackh726]

@bors r+

Simple changes. Theoretical perf improvements, even if nothing on benches.

[bors]

📌 Commit a953574 has been approved by jackh726

[bors]

⌛ Testing commit a953574 with merge d77dcbc...

[bors]

☀️ Test successful - checks-actions
Approved by: jackh726
Pushing d77dcbc to master...