[JSC] Combine FTL code generation into one

[Constellation]

3feec6a

[JSC] Combine FTL code generation into one
https://bugs.webkit.org/show_bug.cgi?id=270684
rdar://124259821

Reviewed by Justin Michaud.

This patch simplifies FTL code generation. Previously we were always generating two codes, one for normal code and one for arity check etc.
But just generating both into one is easy and simple. This patch cleans up around it and use of LinkBuffer / AssemblerData etc. gets simplified.
Originally we were doing so since FTL part is generated by LLVM, and we generate arity check as a separate code, but now both are generated by JSC's
JIT compiler. So we do not need to separate them.

* Source/JavaScriptCore/JavaScriptCore.xcodeproj/project.pbxproj:
* Source/JavaScriptCore/b3/air/AirDisassembler.cpp:
(JSC::B3::Air::Disassembler::dump):
* Source/JavaScriptCore/ftl/FTLCompile.cpp:
(JSC::FTL::compile):
* Source/JavaScriptCore/ftl/FTLGeneratedFunction.h: Removed.
* Source/JavaScriptCore/ftl/FTLJITCode.cpp:
(JSC::FTL::JITCode::~JITCode):
(JSC::FTL::JITCode::initializeAddressForArityCheck):
(JSC::FTL::JITCode::addressForCall):
(JSC::FTL::JITCode::initializeArityCheckEntrypoint): Deleted.
* Source/JavaScriptCore/ftl/FTLJITCode.h:
* Source/JavaScriptCore/ftl/FTLJITFinalizer.h:
* Source/JavaScriptCore/ftl/FTLLink.cpp:
(JSC::FTL::link):
* Source/JavaScriptCore/ftl/FTLState.h:

Canonical link: https://commits.webkit.org/275868@main

455fa32

Misc	iOS, tvOS & watchOS	macOS	Linux	Windows
✅ 🧪 style	✅ 🛠 ios	✅ 🛠 mac	✅ 🛠 wpe	✅ 🛠 wincairo
	✅ 🛠 ios-sim	✅ 🛠 mac-AS-debug	✅ 🧪 wpe-wk2
✅ 🧪 webkitperl	✅ 🧪 ios-wk2	✅ 🧪 api-mac	✅ 🧪 api-wpe
	✅ 🧪 ios-wk2-wpt	✅ 🧪 mac-wk1	✅ 🛠 wpe-skia
✅ 🛠 🧪 jsc	✅ 🧪 api-ios	✅ 🧪 mac-wk2	✅ 🛠 gtk
✅ 🛠 🧪 jsc-arm64	✅ 🛠 tv	✅ 🧪 mac-AS-debug-wk2	✅ 🧪 gtk-wk2
	✅ 🛠 tv-sim		✅ 🧪 api-gtk
	✅ 🛠 watch		✅ 🛠 jsc-armv7
✅ 🛠 🧪 unsafe-merge	✅ 🛠 watch-sim		✅ 🧪 jsc-armv7-tests

[webkit-early-warning-system]

EWS run on previous version of this PR (hash 56e6cef)

Misc	iOS, tvOS & watchOS	macOS	Linux	Windows
✅ 🧪 style	🛠 ios	🛠 mac	🛠 wpe	🛠 wincairo
	🛠 ios-sim	🛠 mac-AS-debug	🧪 wpe-wk2
🧪 webkitperl	🧪 ios-wk2	🧪 api-mac	🧪 api-wpe
	🧪 ios-wk2-wpt	🧪 mac-wk1	🛠 wpe-skia
🛠 🧪 jsc	🧪 api-ios	🧪 mac-wk2	🛠 gtk
🛠 🧪 jsc-arm64	🛠 tv	🧪 mac-AS-debug-wk2	🧪 gtk-wk2
	🛠 tv-sim	🧪 mac-wk2-stress	🧪 api-gtk
	🛠 watch		🛠 jsc-armv7
	🛠 watch-sim		🧪 jsc-armv7-tests

[webkit-early-warning-system]

EWS run on previous version of this PR (hash 65b5530)

Misc	iOS, tvOS & watchOS	macOS	Linux	Windows
✅ 🧪 style	✅ 🛠 ios	✅ 🛠 mac	✅ 🛠 wpe	✅ 🛠 wincairo
	✅ 🛠 ios-sim	✅ 🛠 mac-AS-debug	✅ 🧪 wpe-wk2
✅ 🧪 webkitperl	✅ 🧪 ios-wk2	✅ 🧪 api-mac	✅ 🧪 api-wpe
	✅ 🧪 ios-wk2-wpt	❌ 🧪 mac-wk1	✅ 🛠 wpe-skia
✅ 🛠 🧪 jsc	✅ 🧪 api-ios	✅ 🧪 mac-wk2	✅ 🛠 gtk
✅ 🛠 🧪 jsc-arm64	✅ 🛠 tv	✅ 🧪 mac-AS-debug-wk2	✅ 🧪 gtk-wk2
	✅ 🛠 tv-sim		✅ 🧪 api-gtk
	✅ 🛠 watch		✅ 🛠 jsc-armv7
	✅ 🛠 watch-sim		✅ 🧪 jsc-armv7-tests

[webkit-early-warning-system]

EWS run on current version of this PR (hash 455fa32)

Misc	iOS, tvOS & watchOS	macOS	Linux	Windows
✅ 🧪 style	✅ 🛠 ios	✅ 🛠 mac	✅ 🛠 wpe	✅ 🛠 wincairo
	✅ 🛠 ios-sim	✅ 🛠 mac-AS-debug	✅ 🧪 wpe-wk2
✅ 🧪 webkitperl	✅ 🧪 ios-wk2	✅ 🧪 api-mac	✅ 🧪 api-wpe
	✅ 🧪 ios-wk2-wpt	✅ 🧪 mac-wk1	✅ 🛠 wpe-skia
✅ 🛠 🧪 jsc	✅ 🧪 api-ios	✅ 🧪 mac-wk2	✅ 🛠 gtk
✅ 🛠 🧪 jsc-arm64	✅ 🛠 tv	✅ 🧪 mac-AS-debug-wk2	✅ 🧪 gtk-wk2
	✅ 🛠 tv-sim		✅ 🧪 api-gtk
	✅ 🛠 watch		✅ 🛠 jsc-armv7
✅ 🛠 🧪 unsafe-merge	✅ 🛠 watch-sim		✅ 🧪 jsc-armv7-tests

[justinmichaud]

r=me

[webkit-commit-queue]

Committed 275868@main (3feec6a): https://commits.webkit.org/275868@main

Reviewed commits have been landed. Closing PR #25617 and removing active labels.