[perf-only] Revert "Update expr matcher for Edition 2024 and add expr_2021 nonterminal"

[fmease]

CC #123865
r? ghost

[fmease]

@bors try @rust-timer queue

[bors]

⌛ Trying commit e8d39b6 with merge 428af23...

[bors]

☀️ Try build successful - checks-actions
Build commit: 428af23 (428af23f7fdca618ff29c537b7666c6a06b26d7e)

[rust-timer]

Finished benchmarking commit (428af23): comparison URL.

Overall result: ✅ 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
Regressions ❌ (secondary)	-	-	0
Improvements ✅ (primary)	-	-	0
Improvements ✅ (secondary)	-0.3%	[-0.5%, -0.3%]	8
All ❌✅ (primary)	-	-	0

Max RSS (memory usage)

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

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: 671.076s -> 671.009s (-0.01%)
Artifact size: 315.42 MiB -> 316.20 MiB (0.25%)