[interpreter] Switch passing of new.target to register.

src/interpreter/bytecodes.h

Index: src/interpreter/bytecodes.h
diff --git a/src/interpreter/bytecodes.h b/src/interpreter/bytecodes.h
index a142c1d739fada97da6320d55ee6dbe1fdb0e4f2..78a3b19cf7a7ca381e80f830033e8ff81fc2ba31 100644
--- a/src/interpreter/bytecodes.h
+++ b/src/interpreter/bytecodes.h
@@ -260,6 +260,10 @@ class Register {
   static Register function_context();
   bool is_function_context() const;
 
+  // Returns the register for the incoming new target value.
+  static Register new_target();
+  bool is_new_target() const;
+
   static Register FromOperand(uint8_t operand);
   uint8_t ToOperand() const;