Ben Clayton 11ed0db30d resolver: Don't use ast to_str() methods
These return weird names that love the use of '__' and have little relation to WGSL.

Improve the duplicate case error message.

Clean up control_block_validation_test.cc by making used of the ProgramBuilder helpers.

Bug: tint:1225
Change-Id: I8c4cf3943145cf8372c00d33ae0166c0c0bcbb8b
Reviewed-on: https://dawn-review.googlesource.com/c/tint/+/66442
Kokoro: Kokoro <noreply+kokoro@google.com>
Reviewed-by: Antonio Maiorano <amaiorano@google.com>
Reviewed-by: James Price <jrprice@google.com>
Commit-Queue: Ben Clayton <bclayton@google.com>
2021-10-14 20:30:29 +00:00
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