Remove obsolete 'arguments' local variable handling.

src/accessors.cc

Index: src/accessors.cc
diff --git a/src/accessors.cc b/src/accessors.cc
index 1871822d617663ee9a38fe6db1df6b5ff100f235..94e800a27c0a4c94b06085672de6dffdf9c16902 100644
--- a/src/accessors.cc
+++ b/src/accessors.cc
@@ -1175,20 +1175,7 @@ Handle<Object> GetFunctionArguments(Isolate* isolate,
       return ArgumentsForInlinedFunction(frame, function, function_index);
     }
 
-    if (!frame->is_optimized()) {
-      // If there is an arguments variable in the stack, we return that.
-      Handle<ScopeInfo> scope_info(function->shared()->scope_info());
-      int index = scope_info->StackSlotIndex(
-          isolate->heap()->arguments_string());
-      if (index >= 0) {
-        Handle<Object> arguments(frame->GetExpression(index), isolate);
-        if (!arguments->IsArgumentsMarker()) return arguments;
-      }
-    }
-
-    // If there is no arguments variable in the stack or we have an
-    // optimized frame, we find the frame that holds the actual arguments
-    // passed to the function.
+    // Find the frame that holds the actual arguments passed to the function.
     it.AdvanceToArgumentsFrame();
     frame = it.frame();