Restore the test checks for wider_reduce_into_iter

[DianQK]

The current minimum support is for LLVM 17. Context: #116018 (comment).

r? scottmcm

[scottmcm]

Thanks for circling back to this!

@bors r+ rollup=iffy (probably fine, but whenever there's codegen tests involved things sometimes go weird)

[bors]

📌 Commit ec359f7 has been approved by scottmcm

It is now in the queue for this repository.

[bors]

⌛ Testing commit ec359f7 with merge 929bcee...

[bors]

☀️ Test successful - checks-actions
Approved by: scottmcm
Pushing 929bcee to master...

[bors]

☀️ Test successful - checks-actions
Approved by: scottmcm
Pushing 929bcee to master...

[rust-timer]

Finished benchmarking commit (929bcee): comparison URL.

Overall result: ❌ regressions - ACTION NEEDED

Next Steps: If you can justify the regressions found in this perf run, please indicate this with @rustbot label: +perf-regression-triaged along with sufficient written justification. If you cannot justify the regressions please open an issue or create a new PR that fixes the regressions, add a comment linking to the newly created issue or PR, and then add the perf-regression-triaged label to this PR.

@rustbot label: +perf-regression
cc @rust-lang/wg-compiler-performance

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)	0.5%	[0.5%, 0.6%]	4
Regressions ❌ (secondary)	0.4%	[0.3%, 0.5%]	7
Improvements ✅ (primary)	-	-	0
Improvements ✅ (secondary)	-	-	0
All ❌✅ (primary)	0.5%	[0.5%, 0.6%]	4

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)	-	-	0
Improvements ✅ (primary)	-2.4%	[-2.4%, -2.4%]	1
Improvements ✅ (secondary)	-	-	0
All ❌✅ (primary)	-2.4%	[-2.4%, -2.4%]	1

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: 669.68s -> 668.937s (-0.11%)
Artifact size: 315.70 MiB -> 315.71 MiB (0.00%)

[scottmcm]

Clearly noise; the PR only changed tests/codegen.
@rustbot label: +perf-regression-triaged