glsl: Mark array access when copying to a temporary for the ?: operator.

Piglit's spec/glsl-1.20/compiler/structure-and-array-operations/
array-selection.vert test contains the following code:

   gl_Position = (pick_from_a_or_b ? a : b)[i];

where "a" and "b" are uniform vec4[2] variables.

ast_to_hir creates a temporary vec4[2] variable, conditional_tmp, and
generates an if-block to copy one or the other:

   (declare (temporary) (array vec4 2) conditional_tmp)
   (if (var_ref pick_from_a_or_b)
     ((assign () (var_ref conditional_tmp) (var_ref a)))
     ((assign () (var_ref conditional_tmp) (var_ref b))))

However, we failed to update max_array_access for "a" and "b", so it
remained 0 - here, the whole array is being accessed.  At link time,
update_array_sizes() used this bogus information to change the types
of "a" and "b" to vec4[1].  We then had assignments from a vec4[1] to
a vec4[2], which is highly illegal.

This tripped assertions in nir_split_var_copies with scalar VS.

Signed-off-by: Kenneth Graunke <[email protected]>
Reviewed-by: Jason Ekstrand <[email protected]>
Cc: [email protected]
(cherry picked from commit 9f1e250e77ebd9255bbd9a83bd68c9e4068c2aab)

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