[PERF-EXPERIMENT] Keep two spans per token

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⌛ Trying commit 027c9cc10047651d1772846cbd2a22f8ec70edb5 with merge cbbb10fb4f097e900bc3809024e32de6287162ce...

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⌛ Trying commit 7c10b0d with merge f37f3abab1f6f0025ebe7efeee2a4e6dc53f421c...

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thread '[ui] ui/ast-json/ast-json-output.rs' panicked at 'explicit panic', src/tools/compiletest/src/json.rs:121:21

failures:
    [ui] ui/ast-json/ast-json-noexpand-output.rs
    [ui] ui/ast-json/ast-json-output.rs

[bors]

☀️ Try build successful - checks-actions
Build commit: f37f3abab1f6f0025ebe7efeee2a4e6dc53f421c (f37f3abab1f6f0025ebe7efeee2a4e6dc53f421c)

[rust-timer]

Queued f37f3abab1f6f0025ebe7efeee2a4e6dc53f421c with parent 07a461a, future comparison URL.

[rust-timer]

Finished benchmarking commit (f37f3abab1f6f0025ebe7efeee2a4e6dc53f421c): comparison url.

Summary:

• Primary benchmarks: 😿 relevant regressions found
• Secondary benchmarks: 😿 relevant regressions found

	Regressions 😿 (primary)	Regressions 😿 (secondary)	Improvements 🎉 (primary)	Improvements 🎉 (secondary)	All 😿 🎉 (primary)
count1	115	44	0	0	115
mean2	0.8%	1.2%	N/A	N/A	0.8%
max	2.9%	2.4%	N/A	N/A	2.9%

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. While you can manually mark this PR as fit for rollup, we strongly recommend not doing so since this PR led to changes in compiler perf.

Next Steps: If you can justify the regressions found in this try perf run, please indicate this with @rustbot label: +perf-regression-triaged along with sufficient written justification. If you cannot justify the regressions please fix the regressions and do another perf run. If the next run shows neutral or positive results, the label will be automatically removed.

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

Footnotes

1. number of relevant changes ↩

2. the arithmetic mean of the percent change ↩