Move RegenerateStructNames AST transformation to gl/
This AST transformation is used by the chromium validating command
decoder on Linux/AMD/GL as well as MacOS.
Bug: chromium:1161513
Change-Id: I67e40215ae5576819ba5a58987ceb1776c86c731
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2613195
Commit-Queue: Shahbaz Youssefi <syoussefi@chromium.org>
Reviewed-by: Yuly Novikov <ynovikov@chromium.org>
