[JSC] Emit dyld tracepoint to tell system profiler about JIT code region

[Constellation]

2645a1e

[JSC] Emit dyld tracepoint to tell system profiler about JIT code region
https://bugs.webkit.org/show_bug.cgi?id=271419
rdar://125196249

Reviewed by Justin Michaud.

This patch emits fake dyld tracepoint which tells our system profiler (see SystemTracing.h) about JIT code region.
We need to assign good UUID to this JIT code region. And since this is JIT code, each process has different JIT code.
Thus, we create v5 UUID from process ID and namespace UUID and attach it to JIT code region.

* Source/JavaScriptCore/jit/ExecutableAllocator.cpp:
(JSC::initializeJITPageReservation):
* Source/WTF/wtf/ByteOrder.h:
(WTF::bswap64):
* Source/WTF/wtf/UUID.cpp:
(WTF::UUID::createVersion5):
* Source/WTF/wtf/UUID.h:

Canonical link: https://commits.webkit.org/276524@main

564f537

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 41424ae)

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

[justinmichaud]

r=me

[webkit-early-warning-system]

EWS run on current version of this PR (hash 564f537)

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-commit-queue]

Committed 276524@main (2645a1e): https://commits.webkit.org/276524@main

Reviewed commits have been landed. Closing PR #26271 and removing active labels.

[rkirsling]

Unfortunately, the names bswap64, bswap32, and bswap16 are #defines on FreeBSD.
https://cgit.freebsd.org/src/tree/sys/sys/endian.h#n67