Don't perform dst reads on MSAA targets that require manual resolve

This kind of defeats the purpose of the original intent, which was to
read from the dst without doing a copy. If the target requires a
manual resolve, then we will do an internal copy anyway to resolve
MSAA. And furthermore, we end up resolving the entire render target as
opposed to just copying the op's bounds.

Bug: skia:
Change-Id: I1b4048dc6536853d2c0168c355040f1c3b142736
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/236182
Reviewed-by: Greg Daniel <egdaniel@google.com>
Commit-Queue: Chris Dalton <csmartdalton@google.com>
2 files changed