shader: tell handle-program textures apart when adding descriptors

Every texture whose handle is computed per draw gets the same placeholder
constant buffer address (index 0, offset 0), and Descriptors::Add did not
compare handle_program. Two such textures of the same type and depth in one
shader therefore shared a descriptor, so the second sampled the first, and one
could also merge with a real texture bound at constant buffer 0 offset 0.
Compare handle_program too.

The pixel-format-integer lookup cached its last answer by (index, offset), which
has the same problem for handle programs; skip that cache for them.

Follow-up to 561f87abec.

Assisted-by: Claude Sonnet 5.5 (implementation and commit message)

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