Privacy: try use queue instead of fixed-point iteration

[Bryanskiy]

self-explanatory

r? @petrochenkov

[petrochenkov]

@bors try @rust-timer queue

[rust-log-analyzer]

The job aarch64-gnu-llvm-21-1 failed! Check out the build log: (web) (plain enhanced) (plain)

Click to see the possible cause of the failure (guessed by this bot)

##[endgroup]
Executing "/scripts/stage_2_test_set1.sh"
+ /scripts/stage_2_test_set1.sh
+ '[' 1 == 1 ']'
+ echo 'PR_CI_JOB set; skipping tidy'
+ SKIP_TIDY='--skip tidy'
PR_CI_JOB set; skipping tidy
+ ../x.py --stage 2 test --skip tidy --skip compiler --skip src
##[group]Building bootstrap
    Finished `dev` profile [unoptimized] target(s) in 0.04s
##[endgroup]

[rust-bors]

☀️ Try build successful (CI)
Build commit: cf797a3 (cf797a383bca844619c7f399ee6940b7723eab30, parent: e95e73209faf6ead2bc5c7636e45e589a751b79b)

[rust-timer]

Finished benchmarking commit (cf797a3): comparison URL.

Overall result: ✅ improvements - no action needed

Benchmarking means the PR may be perf-sensitive. It's automatically marked not fit for rolling up. Overriding is possible but disadvised: it risks changing compiler perf.

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

Instruction count

Our most reliable metric. Used to determine the overall result above. However, even this metric can be noisy.

	mean	range	count
Regressions ❌ (primary)	-	-	0
Regressions ❌ (secondary)	-	-	0
Improvements ✅ (primary)	-0.8%	[-5.3%, -0.1%]	101
Improvements ✅ (secondary)	-0.3%	[-1.0%, -0.1%]	17
All ❌✅ (primary)	-0.8%	[-5.3%, -0.1%]	101

Max RSS (memory usage)

Results (primary -1.9%, secondary -0.5%)

A less reliable metric. May be of interest, but not used to determine the overall result above.

	mean	range	count
Regressions ❌ (primary)	-	-	0
Regressions ❌ (secondary)	3.0%	[2.6%, 3.3%]	2
Improvements ✅ (primary)	-1.9%	[-1.9%, -1.9%]	1
Improvements ✅ (secondary)	-1.9%	[-2.5%, -0.4%]	5
All ❌✅ (primary)	-1.9%	[-1.9%, -1.9%]	1

Cycles

Results (primary -0.1%, secondary -0.3%)

A less reliable metric. May be of interest, but not used to determine the overall result above.

	mean	range	count
Regressions ❌ (primary)	2.8%	[2.8%, 2.8%]	1
Regressions ❌ (secondary)	1.8%	[0.4%, 5.0%]	4
Improvements ✅ (primary)	-3.0%	[-3.0%, -3.0%]	1
Improvements ✅ (secondary)	-1.9%	[-4.5%, -0.4%]	5
All ❌✅ (primary)	-0.1%	[-3.0%, 2.8%]	2

Binary size

Results (primary 0.1%, secondary 0.1%)

A less reliable metric. May be of interest, but not used to determine the overall result above.

	mean	range	count
Regressions ❌ (primary)	0.1%	[0.0%, 0.1%]	31
Regressions ❌ (secondary)	0.1%	[0.0%, 0.1%]	21
Improvements ✅ (primary)	-	-	0
Improvements ✅ (secondary)	-	-	0
All ❌✅ (primary)	0.1%	[0.0%, 0.1%]	31

Bootstrap: 493.455s -> 502.405s (1.81%)
Artifact size: 394.43 MiB -> 394.45 MiB (0.00%)