[builtins] Move StringNormalize to a cpp builtin.

src/builtins/builtins.h

Index: src/builtins/builtins.h
diff --git a/src/builtins/builtins.h b/src/builtins/builtins.h
index f9ecb8a0143139aad446b6a3874afca5c33036a5..5e6747043c756d0dae07bb29207d111f2b6dc3bd 100644
--- a/src/builtins/builtins.h
+++ b/src/builtins/builtins.h
@@ -533,6 +533,8 @@ namespace internal {
   TFJ(StringPrototypeCharAt, 2)                                               \
   /* ES6 section 21.1.3.2 String.prototype.charCodeAt ( pos ) */              \
   TFJ(StringPrototypeCharCodeAt, 2)                                           \
+  /* ECMA-262 v6, section 21.1.3.12 String.prototype.normalize ( [form] ) */  \
+  CPP(StringPrototypeNormalize)                                               \
   /* ES6 section 21.1.3.25 String.prototype.toString () */                    \
   TFJ(StringPrototypeToString, 1)                                             \
   CPP(StringPrototypeTrim)                                                    \