[JSC] Make RegExp Matched Array creation faster - #78209

178b264

[JSC] Make RegExp Matched Array creation faster
https://bugs.webkit.org/show_bug.cgi?id=328828
rdar://190940940

Reviewed by NOBODY (OOPS!).

This patch makes RegExp Matched Array creation faster by
setting necessary fields when creating a butterfly.
This makes a lot of things unnecessary (e.g. write-barrier).

* Source/JavaScriptCore/runtime/JSArray.cpp:
(JSC::JSArray::tryCreateUninitializedRestrictedButterfly):
(JSC::JSArray::tryCreateUninitializedRestricted):
* Source/JavaScriptCore/runtime/JSArray.h:
* Source/JavaScriptCore/runtime/RegExpMatchesArray.cpp:
(JSC::tryCreateUninitializedRegExpMatchesArrayHavingABadTime):
(JSC::createEmptyRegExpMatchesArray):
(JSC::createRegExpMatchesArrayWithGroupsOrIndices):
(JSC::createRegExpMatchesArrayForPlainRegExpHavingABadTime):
* Source/JavaScriptCore/runtime/RegExpMatchesArray.h:
(JSC::initializeRegExpMatchesArrayOutOfLineProperties):
(JSC::tryCreateUninitializedRegExpMatchesArray):
(JSC::createRegExpMatchesArrayForPlainRegExp):

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