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

src/bootstrapper.cc

Index: src/bootstrapper.cc
diff --git a/src/bootstrapper.cc b/src/bootstrapper.cc
index e484c80203fe6e9b4817c3215cc18ee95a7887e3..ec6ab1a2c27dc54cee0e3d20817d92da5c2a26fc 100644
--- a/src/bootstrapper.cc
+++ b/src/bootstrapper.cc
@@ -1522,7 +1522,7 @@ void Genesis::InitializeGlobal(Handle<JSGlobalObject> global_object,
 
     // Install the String.fromCharCode function.
     SimpleInstallFunction(string_fun, "fromCharCode",
-                          Builtins::kStringFromCharCode, 1, true);
+                          Builtins::kStringFromCharCode, 1, false);
 
     // Install the String.fromCodePoint function.
     SimpleInstallFunction(string_fun, "fromCodePoint",