Make SkSL CPP code gen copy explicit coord status for cloned FPs

Change-Id: I1479136de8fcab32e2be661fd5fae020b319aab8
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/272458
Commit-Queue: Brian Salomon <bsalomon@google.com>
Reviewed-by: Brian Osman <brianosman@google.com>
8 files changed