Add RP codegen support for swizzle-copy-to-slots-indirect.

Change-Id: I2caed83c3302411993a8bd88b8ed9877677a4351
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/657716
Auto-Submit: John Stiles <johnstiles@google.com>
Reviewed-by: Brian Osman <brianosman@google.com>
Commit-Queue: Brian Osman <brianosman@google.com>
3 files changed