mesa: Add a new function for getting the nonconst sampler array index

If the array index is not a constant expression, the existing support
will assume a zero offset (giving us the sampler index of the base of
the array).

For dynamically uniform indexing of sampler arrays, we need both that
and the indexing expression.

Signed-off-by: Chris Forbes <[email protected]>
Reviewed-by: Matt Turner <[email protected]>
Reviewed-by: Ilia Mirkin <[email protected]>

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