Print Spec Constant value in type array by default

[spencer-lunarg]

Instead of printing a mysterious 0xFFFFFFFF, print the default spec constant value and make use of the spec_constant_op_ids field

so something like

layout(constant_id = 3) const int SIZE = 2;
layout(set = 0, binding = 0, std430) buffer SSBO {
    float val[SIZE];
} ssbo;

now shows

// SpvReflectArrayTraits
dims_count = 0
- dims = [0xFFFFFFFF]
- spec_constant_op_ids = [constant_id]
+ dims = [2]
+ spec_constant_op_ids = [3]

(cc @muraj @zbendefy it would be awesome to get feedback if this helps solve your problems or not)