[Codegen][GPU] Add RDNA4 materialize encoding test - #24924

Hello @Prajit-Rahul 👋

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I have read and understand the IREE project policies, including the AI Tool Use Policy, and agree to follow them. I understand and can vouch for all changes submitted in this PR.

The workflow approval requests expired before CI ran. Could a maintainer please approve and re-run the workflows?

Hi @AGindinson , @egebeysel , and @phemashekar. When convenient, I would appreciate any feedback you may have on this PR. Thank you for your time!