Rearrange some methods so that they get inlined.

runtime/vm/native_arguments.h

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #ifndef VM_NATIVE_ARGUMENTS_H_
 #define VM_NATIVE_ARGUMENTS_H_
 
 #include "platform/assert.h"
 #include "vm/globals.h"
+#include "vm/handles_impl.h"
 #include "vm/simulator.h"
 #include "vm/stub_code.h"
 
 namespace dart {
 
 // Forward declarations.
 class BootstrapNatives;
 class Isolate;
 class Object;
 class RawObject;
@@ skipping 83 matching lines @@
     if ((index == 0) && ToClosureFunction() && ToInstanceFunction()) {
       // Retrieve the receiver from the context.
       const Context& context = Context::Handle(isolate_->top_context());
       return context.At(0);
     } else {
       const int actual_index = index + NumHiddenArgs();
       return ArgAt(actual_index);
     }
   }
 
-  void SetReturn(const Object& value) const;
+  void SetReturn(const Object& value) const {
+    *retval_ = value.raw();
+  }
 
   static intptr_t isolate_offset() {
     return OFFSET_OF(NativeArguments, isolate_);
   }
   static intptr_t argc_tag_offset() {
     return OFFSET_OF(NativeArguments, argc_tag_);
   }
   static intptr_t argv_offset() { return OFFSET_OF(NativeArguments, argv_); }
   static intptr_t retval_offset() {
     return OFFSET_OF(NativeArguments, retval_);
@@ skipping 33 matching lines @@
   class InstanceFunctionBit : public BitField<bool, kInstanceFunctionBit, 1> {};
   class ClosureFunctionBit : public BitField<bool, kClosureFunctionBit, 1> {};
   friend class Api;
   friend class BootstrapNatives;
   friend class Simulator;
 
   // Since this function is passed a RawObject directly, we need to be
   // exceedingly careful when we use it.  If there are any other side
   // effects in the statement that may cause GC, it could lead to
   // bugs.
-  void SetReturnUnsafe(RawObject* value) const;
+  void SetReturnUnsafe(RawObject* value) const {
+    *retval_ = value;
+  }
 
   Isolate* isolate_;  // Current isolate pointer.
   int argc_tag_;  // Encodes argument count and invoked native call type.
   RawObject*(*argv_)[];  // Pointer to an array of arguments to runtime call.
   RawObject** retval_;  // Pointer to the return value area.
 };
 
 }  // namespace dart
 
 #endif  // VM_NATIVE_ARGUMENTS_H_