[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 ec15abac068b168d5b256fcd1d2c5684eac98aef..87e300a7c469eba599e89e98955c2c3b8e832646 100644
--- a/runtime/vm/kernel_reader.h
+++ b/runtime/vm/kernel_reader.h
@@ -106,6 +106,12 @@ class KernelReader {
                      const dart::Class& owner,
                      bool in_class);
 
+  template <typename U>
+  void ReadAndSetupTypeParameters(U* 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