E.g. sem info for "f().x" returned false for HasSideEffects().
Bug: tint:1300
Change-Id: I789f75eef834c58a93e07d93c8334635d39981c3
Reviewed-on: https://dawn-review.googlesource.com/c/tint/+/83100
Kokoro: Kokoro <noreply+kokoro@google.com>
Reviewed-by: James Price <jrprice@google.com>
Reviewed-by: Ben Clayton <bclayton@google.com>
Commit-Queue: Antonio Maiorano <amaiorano@google.com>