glsl: Don't clone assignment conditions

At this point, this should always be NULL.

Reviewed-by: Matt Turner <mattst88@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/14573>

src/compiler/glsl/opt_array_splitting.cpp

@@ -415,11 +415,10 @@ ir_array_splitting_visitor::visit_leave(ir_assignment *ir)
          ir_rvalue *rhs_i =
             new(mem_ctx) ir_dereference_array(ir->rhs->clone(mem_ctx, NULL),
                                               new(mem_ctx) ir_constant(i));
-         ir_rvalue *condition_i =
-            ir->condition ? ir->condition->clone(mem_ctx, NULL) : NULL;
 
-         ir_assignment *assign_i =
-            new(mem_ctx) ir_assignment(lhs_i, rhs_i, condition_i);
+         assert(ir->condition == NULL);
+
+         ir_assignment *assign_i = new(mem_ctx) ir_assignment(lhs_i, rhs_i);
 
          ir->insert_before(assign_i);
          assign_i->accept(this);