microsoft/compiler: DXIL validator 1.6 uses a new PSV resource struct

microsoft/compiler: DXIL validator 1.6 uses a new PSV resource struct

This is a huge pain because it's an array, meaning that accessing
an entry in the array now depends on the validator version to use
the right element stride.

We could always just store the v1 and downconvert if needed... but
this isn't *that* bad that I felt I had to do it that way.

Reviewed-by: Enrico Galli <enrico.galli@intel.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/17603>