[kernel] Change how TypeParameterType is calculated.

runtime/vm/kernel_reader.h

Index: runtime/vm/kernel_reader.h
diff --git a/runtime/vm/kernel_reader.h b/runtime/vm/kernel_reader.h
index 5be5160e7667c9b3a57f1ca03917a7c506727a82..d47decc2781d55702743dfd867547c4691967bd3 100644
--- a/runtime/vm/kernel_reader.h
+++ b/runtime/vm/kernel_reader.h
@@ -110,6 +110,11 @@ class KernelReader {
                      const dart::Class& owner,
                      bool in_class);
 
+  void ReadAndSetupTypeParameters(const Object& set_on,
+                                  intptr_t type_parameter_count,
+                                  const Class& parameterized_class,
+                                  const Function& parameterized_function);
+
   RawArray* MakeFunctionsArray();
 
   // If klass's script is not the script at the uri index, return a PatchClass