Crash on WebCore::FrameLoader::effectiveReferrerPolicy() after 274396…

…@main on ARM64 with GCC -O3

https://bugs.webkit.org/show_bug.cgi?id=273703

Reviewed by Michael Catanzaro.

This workarounds a bug on GCC (affecting at least GCC 12, 13, 14, 15-nightly)
where the compiler produces wrong code on ARM64 at certain optimization levels
(like -O3) which seems related to lambdas and variants.

This wrong code later leads to a crash when the browser starts at
WebCore::FrameLoader::effectiveReferrerPolicy()

* Source/WebCore/page/Page.cpp:
(WebCore::createMainFrame):

Canonical link: https://commits.webkit.org/279066@main

Source/WebCore/page/Page.cpp

@@ -291,7 +291,14 @@ static constexpr OptionSet<ActivityState> pageInitialActivityState()
     return { ActivityState::IsVisible, ActivityState::IsInWindow };
 }
 
-static Ref<Frame> createMainFrame(Page& page, PageConfiguration::ClientCreatorForMainFrame&& clientCreator, RefPtr<Frame> mainFrameOpener, FrameIdentifier identifier)
+// FIXME: workaround for GCC bug https://gcc.gnu.org/bugzilla/show_bug.cgi?id=115135
+#if COMPILER(GCC) && CPU(ARM64)
+#define GCC_MAYBE_NO_INLINE NEVER_INLINE
+#else
+#define GCC_MAYBE_NO_INLINE
+#endif
+
+GCC_MAYBE_NO_INLINE static Ref<Frame> createMainFrame(Page& page, PageConfiguration::ClientCreatorForMainFrame&& clientCreator, RefPtr<Frame> mainFrameOpener, FrameIdentifier identifier)
 {
     page.relaxAdoptionRequirement();
     return switchOn(WTFMove(clientCreator), [&] (CompletionHandler<UniqueRef<LocalFrameLoaderClient>(LocalFrame&)>&& localFrameClientCreator) -> Ref<Frame> {