tree 86366b026bb7e4d2ce0c6dd19a7d44f1f0bc0ef8
parent 6c5db2afa69756f8f07efd942c88ad5b173fc738
author dan sinclair <dsinclair@chromium.org> 1667312530 +0000
committer Dawn LUCI CQ <dawn-scoped@luci-project-accounts.iam.gserviceaccount.com> 1667312530 +0000

[IR] Track inbound branches to flow nodes.

This CL updates the flow node to track the nodes which are inbound
to the current target. This allows to fix an issue with a loop,
after a continuing with a break, properly eliminating dead code.

This also allows always providing the merge target for an if, it
just knows if it's disconnected by having zero inbound branches.

Bug: tint:1718
Change-Id: Ia9b9dbc734bf1e9cd0c829093c0cb1e470efb32e
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/107800
Commit-Queue: Dan Sinclair <dsinclair@chromium.org>
Reviewed-by: Ben Clayton <bclayton@google.com>
Kokoro: Kokoro <noreply+kokoro@google.com>