[WGSL] Fix type declaration for vector type conversion

[tadeuzagallo]

ccb4ec3

[WGSL] Fix type declaration for vector type conversion
https://bugs.webkit.org/show_bug.cgi?id=256783
rdar://109351633

Reviewed by Myles C. Maxfield and Dan Glastonbury.

The type variable that is only used in the return type, and therefore can't be
inferred, has to be the first type argument so it can explicitly provided when
calling the function while still inferring the second type variable.

* Source/WebGPU/WGSL/TypeDeclarations.rb:
* Source/WebGPU/WGSL/tests/valid/overload.wgsl:

Canonical link: https://commits.webkit.org/264092@main

a8523cf

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[webkit-early-warning-system]

EWS run on current version of this PR (hash a8523cf)

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
	✅ 🧪 ios-wk2-wpt		✅ 🧪 gtk-wk2
	✅ 🧪 api-ios	✅ 🧪 mac-wk2	✅ 🧪 api-gtk
	✅ 🛠 tv	✅ 🧪 mac-AS-debug-wk2
	✅ 🛠 tv-sim
✅ 🛠 🧪 merge	✅ 🛠 watch
	✅ 🛠 watch-sim

[webkit-commit-queue]

Committed 264092@main (ccb4ec3): https://commits.webkit.org/264092@main

Reviewed commits have been landed. Closing PR #13877 and removing active labels.