Use DSL to simplify applyInvocationIDWorkaround

Now that the DSL is available from within the compiler, we can use it
instead of the previous complex IR tree generation.

Change-Id: I7a95d245dbc21386790a1cc786899b38cbdf5345
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/409897
Reviewed-by: John Stiles <johnstiles@google.com>
Reviewed-by: Brian Osman <brianosman@google.com>
Commit-Queue: Ethan Nicholas <ethannicholas@google.com>
1 file changed