[inspector] fix positions for single expression arrow function

src/ast/ast.h

Index: src/ast/ast.h
diff --git a/src/ast/ast.h b/src/ast/ast.h
index 8ff3aa7df75e01184f248ce3fc4476958989b144..c9866e4eae2d5003609d4fd9d68aab8142c3732c 100644
--- a/src/ast/ast.h
+++ b/src/ast/ast.h
@@ -2708,6 +2708,11 @@ class FunctionLiteral final : public Expression {
         IsClassFieldInitializer::update(bit_field_, is_class_field_initializer);
   }
 
+  bool HasSingleReturnBody() {
+    return body_->length() == 1 &&

[Yang, 2016/11/08 12:23:33]

I think adding another flag to FunctionLiteral makes a lot more sense than try
to reverse engineer here.

[kozy, 2016/11/08 16:28:45]

Done.

+           body_->at(0)->node_type() == AstNode::kReturnStatement;
+  }
+
  private:
   friend class AstNodeFactory;