Fixed serious dispatch bug when invoking a top level method inside a class type or hierarchy type

spec/compiler/codegen/def_spec.cr

@@ -349,4 +349,47 @@ describe "Code gen: def" do
       f.object_id
       ").to_i.should eq(0)
   end
+
+  it "codegens dispatch without obj, bug 1" do
+    run("
+      def coco(x : Int32)
+        2
+      end
+
+      def coco(x)
+        3
+      end
+
+      class Foo
+        def foo
+          coco(1 || nil)
+        end
+      end
+
+      Foo.new.foo
+      ").to_i.should eq(2)
+  end
+
+  it "codegens dispatch without obj, bug 1" do
+    run("
+      def coco(x : Int32)
+        2
+      end
+
+      def coco(x)
+        3
+      end
+
+      class Foo
+        def foo
+          coco(1 || nil)
+        end
+      end
+
+      class Bar < Foo
+      end
+
+      (Foo.new || Bar.new).foo
+      ").to_i.should eq(2)
+  end
 end

src/compiler/crystal/codegen.cr

@@ -1777,6 +1777,10 @@ module Crystal
       end
     end
 
+    def match_type_id(type, restriction : Program, type_id)
+      llvm_true
+    end
+
     def match_type_id(type, restriction, type_id)
       case type
       when UnionType, HierarchyType, HierarchyMetaclassType