Rename CheckProgramUnrolledSize to CheckProgramStructure.

This code also checks for recursion and overly-deep call chains, so it's
useful even in cases where we don't care about the program size.

Change-Id: I7f123d95b3881d8738b84c565d0fc46da778314e
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/534664
Reviewed-by: Arman Uguray <armansito@google.com>
Auto-Submit: John Stiles <johnstiles@google.com>
Commit-Queue: Arman Uguray <armansito@google.com>
6 files changed