[PATCH vkd3d v2 06/10] vkd3d-shader/hlsl: Allow more implicit conversions between matrices and vectors.

[Zebediah Figura (she/her)]

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

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Although with the comment that it'd be nice to see some specific tests 
for these. I manually verified that this logic holds for three of the 
four places where we currently use add_implicit_conversion (viz. return 
values, assignments, and constructors); it doesn't hold for the fourth 
(the argument to Load) but that's probably not worth fixing.