The new ObjectPtr design makes non-inlined helper functions a little
more expensive because "this" is always a pointer where pass-by-value
would be more efficient, which is an issue for functions whose size puts
them right at the threshold of getting inlined or not. String::Get falls
into this category when called from RegExpFlagsFromString. In this case,
we can do even better than restoring inlineability by fine-tuning
the control flow a bit.

This should repair the regression in crbug.com/910573

Bug: chromium:910573
Change-Id: Ie6b68ef01cd978ec502d8d6c1da788c77422dce7
Reviewed-on: https://chromium-review.googlesource.com/c/1369087
Commit-Queue: Jakob Kummerow <jkummerow@chromium.org>
Reviewed-by: Yang Guo <yangguo@chromium.org>
Cr-Commit-Position: refs/heads/master@{#58234}

Bug: v8:7779
Change-Id: I79471ecb038b710d21e938efd3f9207da30e6622

NOTRY=true

Change-Id: I79471ecb038b710d21e938efd3f9207da30e6622
Reviewed-on: https://chromium-review.googlesource.com/1071508
Commit-Queue: Sigurd Schneider <sigurds@chromium.org>
Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Cr-Commit-Position: refs/heads/master@{#53319}

Bug: v8:7779
Change-Id: Iabe5b74900885d489309fdfe25674a29e8690965
Reviewed-on: https://chromium-review.googlesource.com/1068745
Commit-Queue: Sigurd Schneider <sigurds@chromium.org>
Reviewed-by: Jakob Gruber <jgruber@chromium.org>
Cr-Commit-Position: refs/heads/master@{#53281}

Defining the subclass within the loop significantly affects subsequent
test results. For instance, the Search benchmark is 50% slower if the
subclass is defined within the loop.

BUG=v8:5339

Review-Url: https://codereview.chromium.org/2537253003
Cr-Commit-Position: refs/heads/master@{#41384}

BUG=v8:5339
NOTRY=true

Review-Url: https://codereview.chromium.org/2532013003
Cr-Commit-Position: refs/heads/master@{#41317}

This adds microbenchmarks for:

* the RegExp constructor,
* flag accessors,
* and RegExp functions: exec, @@match, @@search, test, @@split, @@replace.

Each benchmark is further split to measure fast and slow paths.

BUG=v8:5339

Review-Url: https://codereview.chromium.org/2521263003
Cr-Commit-Position: refs/heads/master@{#41285}