Fix: update the generator code itself for the vec --> ptr change
This reverts commit 44aa1ab584.
Change-Id: Idfec2b42239429e58501ca2ba108ec852891e237
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/266575
Reviewed-by: Mike Reed <reed@google.com>
Commit-Queue: Mike Reed <reed@google.com>