Move SkVMDebugTrace into src/sksl/tracing.

Change-Id: Id4fc455f0eb23aa8d9b6f5474be7f6eba71c48de
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/482698
Auto-Submit: John Stiles <johnstiles@google.com>
Reviewed-by: Brian Osman <brianosman@google.com>
Commit-Queue: John Stiles <johnstiles@google.com>
10 files changed