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Perform a program clone at the end of parsing to remove any unreachable AST nodes. Actually fixing the parser to never create these looks like a huge amount of work. Fixed: tint:749 Change-Id: Ib956634257e0933c9702d6be22f79942f7cf4c51 Reviewed-on: https://dawn-review.googlesource.com/c/tint/+/49520 Kokoro: Kokoro <noreply+kokoro@google.com> Reviewed-by: James Price <jrprice@google.com> Commit-Queue: Ben Clayton <bclayton@google.com>