Image memory barriers don't need to be fixed when Venus' internal
"presentable" layout is PRESENT_SRC (generally only in specific types of
debugging). In that case, skip barrier fixes as early as possible and
remove early returns from procedures deeper in the call stack.
Signed-off-by: Ryan Neph <ryanneph@google.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/29777>
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