Use FxIndexSet in the symbol interner.

[nnethercote]

It makes the code a little nicer.

r? @ghost

[nnethercote]

@bors try @rust-timer queue

[bors]

⌛ Trying commit a7714ac with merge a7b97a4...

[bors]

☀️ Try build successful - checks-actions
Build commit: a7b97a4 (a7b97a4b6049c0febdaab912cb6e3c4b29a5fc4d)

[rust-timer]

Finished benchmarking commit (a7b97a4): comparison URL.

Overall result: ❌✅ regressions and improvements - no action needed

Benchmarking this pull request likely means that it is perf-sensitive, so we're automatically marking it as not fit for rolling up. While you can manually mark this PR as fit for rollup, we strongly recommend not doing so since this PR may lead to changes in compiler perf.

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

Instruction count

This is a highly reliable metric that was used to determine the overall result at the top of this comment.

	mean	range	count
Regressions ❌ (primary)	0.7%	[0.7%, 0.7%]	1
Regressions ❌ (secondary)	1.3%	[1.3%, 1.3%]	1
Improvements ✅ (primary)	-	-	0
Improvements ✅ (secondary)	-0.2%	[-0.2%, -0.2%]	1
All ❌✅ (primary)	0.7%	[0.7%, 0.7%]	1

Max RSS (memory usage)

Results

This is a less reliable metric that may be of interest but was not used to determine the overall result at the top of this comment.

	mean	range	count
Regressions ❌ (primary)	-	-	0
Regressions ❌ (secondary)	3.5%	[1.2%, 7.2%]	11
Improvements ✅ (primary)	-3.0%	[-3.0%, -3.0%]	1
Improvements ✅ (secondary)	-1.8%	[-3.2%, -0.4%]	14
All ❌✅ (primary)	-3.0%	[-3.0%, -3.0%]	1

Cycles

Results

This is a less reliable metric that may be of interest but was not used to determine the overall result at the top of this comment.

	mean	range	count
Regressions ❌ (primary)	-	-	0
Regressions ❌ (secondary)	-	-	0
Improvements ✅ (primary)	-1.4%	[-1.4%, -1.3%]	2
Improvements ✅ (secondary)	-3.4%	[-3.4%, -3.4%]	1
All ❌✅ (primary)	-1.4%	[-1.4%, -1.3%]	2

Binary size

This benchmark run did not return any relevant results for this metric.

Bootstrap: 640.175s -> 636.515s (-0.57%)
Artifact size: 304.51 MiB -> 304.50 MiB (-0.00%)

[nnethercote]

Perf results are neutral :)

r? @cuviper, because this is finishing what he started in #75278

[cuviper]

Awesome, thanks!

@bors r+

[bors]

📌 Commit 94a36d2 has been approved by cuviper

It is now in the queue for this repository.

[bors]

⌛ Testing commit 94a36d2 with merge 2429818...

[bors]

☀️ Test successful - checks-actions
Approved by: cuviper
Pushing 2429818 to master...

[rust-timer]

Finished benchmarking commit (2429818): comparison URL.

Overall result: ❌✅ regressions and improvements - no action needed

@rustbot label: -perf-regression

Instruction count

This is a highly reliable metric that was used to determine the overall result at the top of this comment.

	mean	range	count
Regressions ❌ (primary)	0.7%	[0.7%, 0.7%]	1
Regressions ❌ (secondary)	-	-	0
Improvements ✅ (primary)	-0.2%	[-0.2%, -0.2%]	1
Improvements ✅ (secondary)	-0.2%	[-0.2%, -0.2%]	1
All ❌✅ (primary)	0.2%	[-0.2%, 0.7%]	2

Max RSS (memory usage)

Results

This is a less reliable metric that may be of interest but was not used to determine the overall result at the top of this comment.

	mean	range	count
Regressions ❌ (primary)	1.9%	[1.5%, 2.3%]	2
Regressions ❌ (secondary)	3.5%	[1.2%, 6.9%]	10
Improvements ✅ (primary)	-2.2%	[-3.0%, -1.2%]	4
Improvements ✅ (secondary)	-2.1%	[-4.3%, -0.6%]	12
All ❌✅ (primary)	-0.8%	[-3.0%, 2.3%]	6

Cycles

This benchmark run did not return any relevant results for this metric.

Binary size

This benchmark run did not return any relevant results for this metric.

Bootstrap: 636.637s -> 636.121s (-0.08%)
Artifact size: 304.47 MiB -> 304.58 MiB (0.03%)