James Price 057b7f326e tint/writer/spirv: Use Diagnostics() for errors
Brings the SPIR-V writer in line with other writers.

Change-Id: Iaa261150de953b414f966dd004bd48f7315ceb0c
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/131221
Reviewed-by: Dan Sinclair <dsinclair@chromium.org>
Kokoro: Kokoro <noreply+kokoro@google.com>
Commit-Queue: James Price <jrprice@google.com>
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