Validate function return and parameter types in IR generator

Prevents invalid types from making it to the pipeline stage generator,
when it's too late to do anything.

Bug: oss-fuzz:24542
Change-Id: I8b6fa2afd5d586b0e60bea82e0ec4f3ae43de973
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/307656
Reviewed-by: Ethan Nicholas <ethannicholas@google.com>
Commit-Queue: Brian Osman <brianosman@google.com>
6 files changed