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

src/arguments.h

Index: src/arguments.h
diff --git a/src/arguments.h b/src/arguments.h
index f8fb00c57538aeb32b7a0adcfdc40d0796a91332..3475d374cecd49b7d871dd9ac93aaff347bdb753 100644
--- a/src/arguments.h
+++ b/src/arguments.h
@@ -114,6 +114,27 @@ class CustomArguments : public Relocatable {
 };
 
 
+#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)
 
@@ -123,7 +144,7 @@ Type Name(Arguments args, Isolate* isolate)
 
 
 #define RUNTIME_ARGUMENTS(isolate, args) args, isolate
-
+#endif  // defined(V8_ARM_ON_X86_64)
 
 } }  // namespace v8::internal