[PATCH vkd3d v2] vkd3d-shader/hlsl: Return the shape of the left operand when appropriate.

[Matteo Bruni]

Signed-off-by: Matteo Bruni <mbruni at codeweavers.com>
---
A detail that's not obvious from the patch is that
expr_compatible_data_types() already expects (and accepts) the case
where a vector and a matrix with the same component count are used
together, so this in practice fixes expr_common_shape() to conform to
that.