James Price 02b5b224e3 ir/spirv-writer: Add support for scalar types
Also add a test helper header with some base classes that derive from
the IR builder.

Bug: tint:1906
Change-Id: If642bc64a50b6cae10363018a8dea8547ab9f542
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/131441
Commit-Queue: James Price <jrprice@google.com>
Kokoro: Kokoro <noreply+kokoro@google.com>
Reviewed-by: Dan Sinclair <dsinclair@chromium.org>
2023-05-04 18:50:49 +00:00
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