tree 53209c07a501ac9ad113e7c606bea4fcf6608c90
parent 53dcbbaee0a9f1ff42363a256458eb2a768fbabe
author Jens Johansen <jensj@google.com> 1726668939 +0000
committer Commit Queue <dart-scoped@luci-project-accounts.iam.gserviceaccount.com> 1726668939 +0000

[scanner] StringScanner hints length

In a benchmark of the scanner (yet uncomitted) I get these changes when
using the StringScanner on kernels ast.dart 1000 times:

```
msec task-clock:u: -3.4705% +/- 0.3761% (-184.61 +/- 20.00)
page-faults:u: -0.1131% +/- 0.0007% (-271.44 +/- 1.65)
cycles:u: -3.9203% +/- 0.3881% (-847069842.84 +/- 83859667.38)
instructions:u: -6.2346% +/- 0.0000% (-2935747343.16 +/- 983.91)
branch-misses:u: -5.8606% +/- 0.9062% (-6402751.76 +/- 990004.92)
seconds time elapsed: -3.4701% +/- 0.3757% (-0.18 +/- 0.02)
seconds user: -4.1335% +/- 0.5301% (-0.21 +/- 0.03)
seconds sys: 6.6222% +/- 5.1230% (0.02 +/- 0.02)
Scavenge(   new space) goes from 145 to 127
```

Change-Id: Ic1e0540cc41636161c99571fb4215003dcc11949
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/385761
Commit-Queue: Jens Johansen <jensj@google.com>
Reviewed-by: Johnni Winther <johnniwinther@google.com>
Reviewed-by: Brian Wilkerson <brianwilkerson@google.com>