[WGSL] Offset parameter to texture functions should be a const-expression

[tadeuzagallo]

3b1cf88

[WGSL] Offset parameter to texture functions should be a const-expression
https://bugs.webkit.org/show_bug.cgi?id=276226
rdar://130227871

Reviewed by Mike Wyrzykowski.

According to the spec, the `offset` argument to texture functions must be a
const-expression, and the values must be between -8 and 7.

* Source/WebGPU/WGSL/TypeCheck.cpp:
(WGSL::TypeChecker::visit):
* Source/WebGPU/WGSL/tests/invalid/texture-offset.wgsl: Added.

Canonical link: https://commits.webkit.org/280726@main

fd5d709

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[webkit-early-warning-system]

EWS run on current version of this PR (hash fd5d709)

Details

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

[webkit-commit-queue]

Committed 280726@main (3b1cf88): https://commits.webkit.org/280726@main

Reviewed commits have been landed. Closing PR #30518 and removing active labels.