Update toExistingAtomString() to return an AtomString

[cdumez]

0b2981a

Update toExistingAtomString() to return an AtomString
https://bugs.webkit.org/show_bug.cgi?id=239904

Reviewed by Darin Adler.

Update toExistingAtomString() to return an AtomString instead of a RefPtr<AtomStringImpl >
as it is a bit less awkward to use.

* Source/JavaScriptCore/dfg/DFGOperations.cpp:
(JSC::DFG::JSC_DEFINE_JIT_OPERATION):
* Source/JavaScriptCore/jit/JITOperations.cpp:
(JSC::getByVal):
(JSC::JSC_DEFINE_JIT_OPERATION):
* Source/JavaScriptCore/llint/LLIntSlowPaths.cpp:
(JSC::LLInt::getByVal):
* Source/JavaScriptCore/runtime/CommonSlowPaths.cpp:
(JSC::JSC_DEFINE_COMMON_SLOW_PATH):
* Source/JavaScriptCore/runtime/JSString.h:
(JSC::JSString::toExistingAtomString const):
* Source/WTF/wtf/text/StringView.h:
(WTF::StringView::toExistingAtomString const):
* Source/WebCore/bindings/js/JSDOMConvertStrings.h:
(WebCore::Converter<IDLRequiresExistingAtomStringAdaptor<T > >::convert):
* Source/WebCore/dom/TreeScope.cpp:
(WebCore::TreeScope::getElementById const):
* Source/WebCore/platform/network/ResourceHandle.cpp:
(WebCore::ResourceHandle::create):
(WebCore::ResourceHandle::loadResourceSynchronously):

Canonical link: https://commits.webkit.org/250133@main
git-svn-id: https://svn.webkit.org/repository/webkit/trunk@293627 268f45cc-cd09-0410-ab3c-d52691b4dbfc

[webkit-early-warning-system]

Commit message contains (OOPS!), blocking PR #440

[webkit-early-warning-system]

Committed r293627 (250133@main): https://commits.webkit.org/250133@main

Reviewed commits have been landed. Closing PR #440 and removing active labels.