Make VirtualFrame::CallStub on IA32 responsible for moving arguments...

src/virtual-frame-arm.h

Index: src/virtual-frame-arm.h
===================================================================
--- src/virtual-frame-arm.h	(revision 1625)
+++ src/virtual-frame-arm.h	(working copy)
@@ -248,27 +248,33 @@
   // Push a try-catch or try-finally handler on top of the virtual frame.
   void PushTryHandler(HandlerType type);
 
-  // Call a code stub, given the number of arguments it expects on (and
-  // removes from) the top of the physical frame.
+  // Call stub given the number of arguments it expects on (and
+  // removes from) the stack.
   Result CallStub(CodeStub* stub, int arg_count);
-  Result CallStub(CodeStub* stub, Result* arg, int arg_count);
-  Result CallStub(CodeStub* stub, Result* arg0, Result* arg1, int arg_count);
 
-  // Call the runtime, given the number of arguments expected on (and
-  // removed from) the top of the physical frame.
+  // Call stub that expects its argument in r0.  The argument is given
+  // as a result which must be the register r0.
+  Result CallStub(CodeStub* stub, Result* arg);
+
+  // Call stub that expects its arguments in r1 and r0.  The arguments
+  // are given as results which must be the appropriate registers.
+  Result CallStub(CodeStub* stub, Result* arg0, Result* arg1);
+
+  // Call runtime given the number of arguments expected on (and
+  // removed from) the stack.
   Result CallRuntime(Runtime::Function* f, int arg_count);
   Result CallRuntime(Runtime::FunctionId id, int arg_count);
 
-  // Invoke a builtin, given the number of arguments it expects on (and
-  // removes from) the top of the physical frame.
+  // Invoke builtin given the number of arguments it expects on (and
+  // removes from) the stack.
   Result InvokeBuiltin(Builtins::JavaScript id,
                        InvokeJSFlags flag,
                        Result* arg_count_register,
                        int arg_count);
 
-  // Call into a JS code object, given the number of arguments it
-  // removes from the top of the physical frame.
-  // Register arguments are passed as results and consumed by the call.
+  // Call into an IC stub given the number of arguments it removes
+  // from the stack.  Register arguments are passed as results and
+  // consumed by the call.
   Result CallCodeObject(Handle<Code> ic,
                         RelocInfo::Mode rmode,
                         int dropped_args);