Don't lower inner_span multiple times

[JonathanBrouwer]

No description provided.

[rustbot]

Some changes occurred in compiler/rustc_attr_parsing

cc @jdonszelmann

[rustbot]

r? @mejrs

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The reviewer was selected based on:

• Owners of files modified in this PR: compiler
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[JonathanBrouwer]

Probably not significant for perf but just in case
@bors try @rust-timer queue

[rust-bors]

☀️ Try build successful (CI)
Build commit: 604d7a1 (604d7a1fe991be514efb54032e4c1cc8c35d9de9, parent: f375177a48bcab5e27d800b464fa25363c0198f1)

[rust-timer]

Finished benchmarking commit (604d7a1): comparison URL.

Overall result: no relevant changes - no action needed

Benchmarking means the PR may be perf-sensitive. Consider adding rollup=never if this change is not fit for rolling up.

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

Instruction count

This perf run didn't have relevant results for this metric.

Max RSS (memory usage)

Results (primary 4.3%)

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

	mean	range	count
Regressions ❌ (primary)	4.3%	[4.3%, 4.3%]	1
Regressions ❌ (secondary)	-	-	0
Improvements ✅ (primary)	-	-	0
Improvements ✅ (secondary)	-	-	0
All ❌✅ (primary)	4.3%	[4.3%, 4.3%]	1

Cycles

Results (primary -1.8%, secondary -5.6%)

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)	-	-	0
Improvements ✅ (primary)	-1.8%	[-1.8%, -1.8%]	1
Improvements ✅ (secondary)	-5.6%	[-5.6%, -5.6%]	1
All ❌✅ (primary)	-1.8%	[-1.8%, -1.8%]	1

Binary size

Results (secondary -0.0%)

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)	-	-	0
Improvements ✅ (primary)	-	-	0
Improvements ✅ (secondary)	-0.0%	[-0.0%, -0.0%]	1
All ❌✅ (primary)	-	-	0

Bootstrap: 521.294s -> 511.508s (-1.88%)
Artifact size: 400.74 MiB -> 400.71 MiB (-0.01%)