[turbofan]: Convert StringFromCharCode to var-args style TF builtin

src/builtins/builtins.h

Index: src/builtins/builtins.h
diff --git a/src/builtins/builtins.h b/src/builtins/builtins.h
index e421fb3d8e2999a5b10bd51206453885b4b9284c..f1502e6c143cdf55eeb3c41b13dd2aad37985ec5 100644
--- a/src/builtins/builtins.h
+++ b/src/builtins/builtins.h
@@ -621,7 +621,7 @@ namespace internal {
   ASM(StringConstructor_ConstructStub)                                        \
   CPP(StringFromCodePoint)                                                    \
   /* ES6 section 21.1.2.1 String.fromCharCode ( ...codeUnits ) */             \
-  TFJ(StringFromCharCode, 1)                                                  \
+  TFJ(StringFromCharCode, -1)                                                 \

[Benedikt Meurer, 2016/11/07 06:36:34]

Can we use SharedFunctionInfo::kDontAdaptArgumentsSentinel here to avoid the
magic -1 here?

[danno, 2016/11/07 16:43:52]

Done.

   /* ES6 section 21.1.3.1 String.prototype.charAt ( pos ) */                  \
   TFJ(StringPrototypeCharAt, 1)                                               \
   /* ES6 section 21.1.3.2 String.prototype.charCodeAt ( pos ) */              \