Remove SkSL ABORT() macro.

Existing call sites have been converted to the SK_ABORT macro.
The sksl_abort() function is no longer referenced and has been removed.

Change-Id: Idf94ce2523e37b62ce87b60afc5d121b9ad29627
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/364858
Commit-Queue: John Stiles <johnstiles@google.com>
Auto-Submit: John Stiles <johnstiles@google.com>
Reviewed-by: Brian Osman <brianosman@google.com>
18 files changed