[d3d9] Handle remaining edge cases of Discard & Lockable #4176
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A bunch of edge cases we weren't handling properly.
This is gonna need some testing.
In theory we could also use VK_STORE_OP_DONT_CARE for discardable depth stencil surfaces but I don't think that's worth the additional complexity. Tracking the load op is already a bit of a mess. Games don't really use discardable depth stencil surfaces all that much and it would only help tilers anyway as far as I know.