[Bug 94129] Mesa's compiler should warn about undefined values

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=94129

--- Comment #6 from Alejandro Piñeiro (freenode IRC: apinheiro) <apinheiro at igalia.com> ---
After some extra code checking on both AST and IR.

(In reply to Timothy Arceri from comment #4)
> The AST is a bit awkward to work with beyond basic validation. You would
> likely find it easier to add this in GLSL IR somewhere.

There is another reason to try to do this on the ast_to_hir pass. As in the NIR

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