James Price 6251598ad2 tint: Add DemoteToHelper transform
This transform implements demote-to-helper semantics for discard
statements, by setting a global flag and masking any writes to
host-visible memory.

Bug: tint:1723
Change-Id: I619c5661c6ffcc6978aa4f7635b0d680d83de3dd
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/109002
Kokoro: Kokoro <noreply+kokoro@google.com>
Reviewed-by: Ben Clayton <bclayton@google.com>
Commit-Queue: James Price <jrprice@google.com>
2022-11-09 15:40:06 +00:00
..
2022-11-08 23:24:52 +00:00
2022-11-09 15:40:06 +00:00