dan sinclair d336733c83 [IR] Add switch control flow node.
This CL updates the IR builder to create control flow nodes for
a switch statement and the contained case statements.

Bug: tint:1718
Change-Id: I05b73db11ab14676cc123f436ae5912b1dbee0d5
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/107801
Reviewed-by: Ben Clayton <bclayton@google.com>
Kokoro: Kokoro <noreply+kokoro@google.com>
Commit-Queue: Dan Sinclair <dsinclair@chromium.org>
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