Remove the rest_parameter(int*) variant, use rest_parameter() instead.

src/interpreter/bytecode-generator.cc

Index: src/interpreter/bytecode-generator.cc
diff --git a/src/interpreter/bytecode-generator.cc b/src/interpreter/bytecode-generator.cc
index a57399cf6f046e4ee3150e55293a78fa027114d1..ca2723b4c238ad3d11f74d19b67e4dd52a02091d 100644
--- a/src/interpreter/bytecode-generator.cc
+++ b/src/interpreter/bytecode-generator.cc
@@ -771,8 +771,7 @@ void BytecodeGenerator::GenerateBytecodeBody() {
   VisitArgumentsObject(scope()->arguments());
 
   // Build rest arguments array if it is used.
-  int rest_index;
-  Variable* rest_parameter = scope()->rest_parameter(&rest_index);
+  Variable* rest_parameter = scope()->rest_parameter();
   VisitRestArgumentsArray(rest_parameter);
 
   // Build assignment to {.this_function} variable if it is used.