[PATCH vkd3d 3/3] vkd3d-shader/hlsl: Simplify expr_common_base_type.

[Zebediah Figura (she/her)]

Signed-off-by: Zebediah Figura <zfigura at codeweavers.com>


It'd be nice to have some tests for this (and 2/3), though, even if they 
don't pass yet for some reason ;-)