[interpreter] Make sure allocated registers are always materialized in the register optimizer.

src/interpreter/bytecode-register-optimizer.h

Index: src/interpreter/bytecode-register-optimizer.h
diff --git a/src/interpreter/bytecode-register-optimizer.h b/src/interpreter/bytecode-register-optimizer.h
index 3ec2c657d0a036e42ce3c54df7220ab2763b0488..d5313055a6f24b8e992619cebc8ea467b98dbcdb 100644
--- a/src/interpreter/bytecode-register-optimizer.h
+++ b/src/interpreter/bytecode-register-optimizer.h
@@ -178,6 +178,8 @@ class V8_EXPORT_PRIVATE BytecodeRegisterOptimizer final
     return equivalence_id_;
   }
 
+  void AllocateRegister(RegisterInfo* info);
+
   Zone* zone() { return zone_; }
 
   const Register accumulator_;