Use null type argument vector instead of vector of Dynamic for a generic raw

runtime/vm/raw_object.h

Index: runtime/vm/raw_object.h
===================================================================
--- runtime/vm/raw_object.h	(revision 6004)
+++ runtime/vm/raw_object.h	(working copy)
@@ -405,7 +405,10 @@
  private:
   RAW_HEAP_OBJECT_IMPLEMENTATION(TypeParameter);
 
-  RawObject** from() { return reinterpret_cast<RawObject**>(&ptr()->name_); }
+  RawObject** from() {
+      return reinterpret_cast<RawObject**>(&ptr()->parameterized_class_);
+  }
+  RawClass* parameterized_class_;
   RawString* name_;
   RawObject** to() { return reinterpret_cast<RawObject**>(&ptr()->name_); }
   intptr_t index_;