Reserve capacity for 3% anon nodes

[Zoxc]

This reserves capacity for 3% anon nodes instead of 100%. For the benchmark suite the mean is ~1.6% and max ~5.8%, so I picked a middle ground.

[Zoxc]

@bors try @rust-timer queue

[Zoxc]

Mostly cuts down on committed memory locally:

Benchmark	Before	After		Before	After		Before	After
	Time	Time	%	Physical Memory	Physical Memory	%	Committed Memory	Committed Memory	%
🟣 clap:check:unchanged	0.3162s	0.3130s	-1.00%	90.68 MiB	90.39 MiB	-0.32%	163.99 MiB	157.86 MiB	💚 -3.74%
🟣 hyper:check:unchanged	0.1313s	0.1314s	0.10%	56.85 MiB	56.80 MiB	-0.09%	121.74 MiB	120.23 MiB	💚 -1.23%
🟣 regex:check:unchanged	0.2275s	0.2278s	0.11%	76.87 MiB	76.66 MiB	-0.27%	143.66 MiB	137.63 MiB	💚 -4.19%
🟣 syn:check:unchanged	0.4812s	0.4833s	0.43%	111.32 MiB	110.91 MiB	-0.37%	184.00 MiB	171.91 MiB	💚 -6.57%
Total	1.1563s	1.1556s	-0.06%	335.71 MiB	334.75 MiB	-0.29%	613.38 MiB	587.64 MiB	💚 -4.20%
Summary	1.0000s	0.9991s	-0.09%	1 byte	1.00 bytes	-0.26%	1 byte	0.96 bytes	💚 -3.93%

[rust-bors]

☀️ Try build successful (CI)
Build commit: 07c4617 (07c46175c09f1f6c0cfa270871a3c03c3aadd621)
Base parent: 6d656b1 (6d656b1efca82491a110b476ac9bbe712628ccb6)

[rust-timer]

Finished benchmarking commit (07c4617): comparison URL.

Overall result: ❌✅ regressions and improvements - 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

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)	0.8%	[0.8%, 0.8%]	1
Improvements ✅ (primary)	-	-	0
Improvements ✅ (secondary)	-0.8%	[-0.8%, -0.8%]	1
All ❌✅ (primary)	-	-	0

Max RSS (memory usage)

Results (primary -0.7%, 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)	2.0%	[1.7%, 2.3%]	2
Regressions ❌ (secondary)	3.1%	[0.8%, 6.1%]	8
Improvements ✅ (primary)	-1.2%	[-2.5%, -0.4%]	11
Improvements ✅ (secondary)	-4.8%	[-6.6%, -2.7%]	5
All ❌✅ (primary)	-0.7%	[-2.5%, 2.3%]	13

Cycles

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

Binary size

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

Bootstrap: 468.493s -> 457.557s (-2.33%)
Artifact size: 398.93 MiB -> 398.90 MiB (-0.01%)

[rustbot]

r? @davidtwco

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