glsl: Don't split arrays in the condition of an assignment

At this point, this should always be NULL.

v2: Fix bad rebase.

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

@@ -435,11 +435,6 @@ ir_array_splitting_visitor::visit_leave(ir_assignment *ir)
    handle_rvalue(&ir->rhs);
    ir->rhs->accept(this);
 
-   if (ir->condition) {
-      handle_rvalue(&ir->condition);
-      ir->condition->accept(this);
-   }
-
    return visit_continue;
 }