[VM generic function reification] Support generic functions in Invocation class.

runtime/vm/raw_object.h

Index: runtime/vm/raw_object.h
diff --git a/runtime/vm/raw_object.h b/runtime/vm/raw_object.h
index 74792a043909e258b7be46682ffdaeae1e5fe258..d11d04db3e9767e393c8ea28b4ace3b9e3960d18 100644
--- a/runtime/vm/raw_object.h
+++ b/runtime/vm/raw_object.h
@@ -782,37 +782,6 @@ class RawUnresolvedClass : public RawObject {
   TokenPosition token_pos_;
 };
 
-class RawTypeArguments : public RawObject {
- private:
-  RAW_HEAP_OBJECT_IMPLEMENTATION(TypeArguments);
-
-  RawObject** from() {
-    return reinterpret_cast<RawObject**>(&ptr()->instantiations_);
-  }
-  // The instantiations_ array remains empty for instantiated type arguments.
-  RawArray* instantiations_;  // Array of paired canonical vectors:
-                              // Even index: instantiator.
-                              // Odd index: instantiated (without bound error).
-  // Instantiations leading to bound errors do not get cached.
-  RawSmi* length_;
-
-  RawSmi* hash_;
-
-  // Variable length data follows here.
-  RawAbstractType* const* types() const {
-    OPEN_ARRAY_START(RawAbstractType*, RawAbstractType*);
-  }
-  RawAbstractType** types() {
-    OPEN_ARRAY_START(RawAbstractType*, RawAbstractType*);
-  }
-  RawObject** to(intptr_t length) {
-    return reinterpret_cast<RawObject**>(&ptr()->types()[length - 1]);
-  }
-
-  friend class Object;
-  friend class SnapshotReader;
-};
-
 class RawPatchClass : public RawObject {
  private:
   RAW_HEAP_OBJECT_IMPLEMENTATION(PatchClass);
@@ -1692,6 +1661,37 @@ class RawLibraryPrefix : public RawInstance {
   bool is_loaded_;
 };
 
+class RawTypeArguments : public RawInstance {
+ private:
+  RAW_HEAP_OBJECT_IMPLEMENTATION(TypeArguments);
+
+  RawObject** from() {
+    return reinterpret_cast<RawObject**>(&ptr()->instantiations_);
+  }
+  // The instantiations_ array remains empty for instantiated type arguments.
+  RawArray* instantiations_;  // Array of paired canonical vectors:
+                              // Even index: instantiator.
+                              // Odd index: instantiated (without bound error).
+  // Instantiations leading to bound errors do not get cached.
+  RawSmi* length_;
+
+  RawSmi* hash_;
+
+  // Variable length data follows here.
+  RawAbstractType* const* types() const {
+    OPEN_ARRAY_START(RawAbstractType*, RawAbstractType*);
+  }
+  RawAbstractType** types() {
+    OPEN_ARRAY_START(RawAbstractType*, RawAbstractType*);
+  }
+  RawObject** to(intptr_t length) {
+    return reinterpret_cast<RawObject**>(&ptr()->types()[length - 1]);
+  }
+
+  friend class Object;
+  friend class SnapshotReader;
+};
+
 class RawAbstractType : public RawInstance {
  protected:
   enum TypeState {