[NOT FOR COMMIT] Native Client builds of V8 on ia32 and x64.

src/arguments.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 96 matching lines @@
   }
 
   void IterateInstance(ObjectVisitor* v);
   Object** end() { return values_ + ARRAY_SIZE(values_) - 1; }
 
  private:
   Object* values_[4];
 };
 
 
+#if defined(V8_ARM_ON_X86_64)
+// In arm/simulator-arm.cc, invocations of runtime functions
+// assume that adjacent parameters will be automagically coalesced
+// into call-by-value structures on the stack. This is okay for
+// 32-bit but fails for 64-bit. We use a small stub routine to
+// fix this, coalescing the first two parameters into the expected
+// structure.
+#define DECLARE_RUNTIME_FUNCTION(Type, Name)    \
+Type Name(int argslength, Object** argsobject, Isolate* isolate)
+
+#define RUNTIME_FUNCTION(Type, Name)            \
+static Type __x86_64_impl_##Name(Arguments args, Isolate* isolate);  \
+Type Name(int argslength, Object** argsobject, Isolate* isolate) {   \
+  Arguments args(argslength, argsobject);                            \
+  return __x86_64_impl_##Name(args, isolate);                        \
+}                                                                    \
+static Type __x86_64_impl_##Name(Arguments args, Isolate* isolate)
+
+#define RUNTIME_ARGUMENTS(isolate, args) \
+  args.length(), args.arguments(), isolate
+#else
 #define DECLARE_RUNTIME_FUNCTION(Type, Name)    \
 Type Name(Arguments args, Isolate* isolate)
 
 
 #define RUNTIME_FUNCTION(Type, Name)            \
 Type Name(Arguments args, Isolate* isolate)
 
 
 #define RUNTIME_ARGUMENTS(isolate, args) args, isolate
-
+#endif  // defined(V8_ARM_ON_X86_64)
 
 } }  // namespace v8::internal
 
 #endif  // V8_ARGUMENTS_H_