[Interpreter] Optimize equality check with null/undefined with a check on the map.

src/interpreter/bytecodes.h

Index: src/interpreter/bytecodes.h
diff --git a/src/interpreter/bytecodes.h b/src/interpreter/bytecodes.h
index 05c0afe8f6bacd2ea33142eeee53d78c38762f6f..65ececca7ce1c08c529d138c7029448f9ff9f9fe 100644
--- a/src/interpreter/bytecodes.h
+++ b/src/interpreter/bytecodes.h
@@ -183,6 +183,9 @@ namespace interpreter {
   V(TestInstanceOf, AccumulatorUse::kReadWrite, OperandType::kReg)             \
   V(TestIn, AccumulatorUse::kReadWrite, OperandType::kReg)                     \
                                                                                \
+  /* TestEqual with Null or Undefined */                                       \
+  V(TestUndetectable, AccumulatorUse::kWrite, OperandType::kReg)               \
+                                                                               \
   /* Cast operators */                                                         \
   V(ToName, AccumulatorUse::kRead, OperandType::kRegOut)                       \
   V(ToNumber, AccumulatorUse::kRead, OperandType::kRegOut)                     \