SkSL For statement now enforces correct initializer type

Bug: skia:11870
Change-Id: I960800ac554e3c189d0b708fa6cabccf071fd020
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/397460
Commit-Queue: Ethan Nicholas <ethannicholas@google.com>
Reviewed-by: John Stiles <johnstiles@google.com>
4 files changed