nir/spirv: Fix atomic counter (multidimensional-)arrays

nir/spirv: Fix atomic counter (multidimensional-)arrays

When constructing NIR if we have a SPIR-V uint variable and the
storage class is SpvStorageClassAtomicCounter, we store as NIR's
glsl_type an atomic_uint to reflect the fact that the variable is an
atomic counter.

However, we were tweaking the type only for atomic_uint scalars, we
have to do it as well for atomic_uint arrays and atomic_uint arrays of
arrays of any depth.

Signed-off-by: Antia Puentes <apuentes@igalia.com>
Signed-off-by: Alejandro Piñeiro <apinheiro@igalia.com>
v2: update after deref patches got pushed (Alejandro Piñeiro)
v3: simplify repair_atomic_type (suggested by Timothy Arceri, included
    on the patch by Alejandro)

Reviewed-by: Timothy Arceri <tarceri@itsqueeze.com>