dan sinclair 6a4c918cbf [ir] Sketch out tree walk
This CL adds the sketch of how to walk the IR tree in order to rebuild
the format of the original control flow.

Bug: tint:1718
Change-Id: Id9376d51907ea2a60f32506a152928b3a82d14ed
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/110481
Kokoro: Kokoro <noreply+kokoro@google.com>
Commit-Queue: Dan Sinclair <dsinclair@chromium.org>
Reviewed-by: Ben Clayton <bclayton@google.com>
2022-11-17 19:15:07 +00:00
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