Fix ScopeInfo::StackSlotIndex to skip over non-locals

src/accessors.cc

Index: src/accessors.cc
diff --git a/src/accessors.cc b/src/accessors.cc
index 9850cd388e416549ddd43e81672f9688c58728b3..4186bf4edf7630cfd443e4a70321b9959a0e959e 100644
--- a/src/accessors.cc
+++ b/src/accessors.cc
@@ -1188,8 +1188,8 @@ Handle<Object> GetFunctionArguments(Isolate* isolate,
     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());
+      int index =
+          scope_info->StackLocalSlotIndex(isolate->heap()->arguments_string());
       if (index >= 0) {
         Handle<Object> arguments(frame->GetExpression(index), isolate);
         if (!arguments->IsArgumentsMarker()) return arguments;