[WGSL] CompoundStatement should introduce a new scope

[tadeuzagallo]

d463a81

[WGSL] CompoundStatement should introduce a new scope
https://bugs.webkit.org/show_bug.cgi?id=254523
rdar://107267001

Reviewed by Myles C. Maxfield.

Two sibling CompooundStatements (blocks) should have their own scopes, and therefore
be able to introduce variables with the same name.
This patch also includes a test file, which depends on PR #11995 to be executed,
and for now can only be executed manually.

* Source/WebGPU/WGSL/MangleNames.cpp:
(WGSL::NameManglerVisitor::visit):
* Source/WebGPU/WGSL/TypeCheck.cpp:
(WGSL::TypeChecker::visitFunctionBody):
(WGSL::TypeChecker::visit):
* Source/WebGPU/WGSL/tests/valid/scope.wgsl: Added.

Canonical link: https://commits.webkit.org/262197@main

2d46adb

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

[webkit-early-warning-system]

EWS run on current version of this PR (hash 2d46adb)

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

[litherum]

🆒

[webkit-commit-queue]

Committed 262197@main (d463a81): https://commits.webkit.org/262197@main

Reviewed commits have been landed. Closing PR #12006 and removing active labels.