Translator: Fix validation failure in RemoveDynamicIndexing This transformation adds function definitions to the tree after the fact, so function call validation is disabled until the transformation is complete. Bug: chromium:1246686 Change-Id: I40f77cb25cf272d5ebc42ece572371ce5161e819 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/3148850 Reviewed-by: Jamie Madill <jmadill@chromium.org> Commit-Queue: Shahbaz Youssefi <syoussefi@chromium.org>