Interpreter: Compute max stack depth needed

Change-Id: I171a680aac554a0015d1854c46b35e9c9785fdf3
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/227061
Reviewed-by: Mike Klein <mtklein@google.com>
Commit-Queue: Brian Osman <brianosman@google.com>
4 files changed