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

src/builtins/builtins.cc

Index: src/builtins/builtins.cc
diff --git a/src/builtins/builtins.cc b/src/builtins/builtins.cc
index 8e32cc57796ecaa7343bb6c4d86666e97e3c8e06..ff2cf5e885a65eb7d024c9a2449bfa5f70016d0d 100644
--- a/src/builtins/builtins.cc
+++ b/src/builtins/builtins.cc
@@ -84,7 +84,7 @@ Code* BuildWithCodeStubAssemblerJS(Isolate* isolate,
                                    Code::Flags flags, const char* name) {
   HandleScope scope(isolate);
   Zone zone(isolate->allocator(), ZONE_NAME);
-  const int argc_with_recv = argc + 1;
+  const int argc_with_recv = (argc == -1) ? 0 : argc + 1;
   CodeStubAssembler assembler(isolate, &zone, argc_with_recv, flags, name);
   generator(&assembler);
   Handle<Code> code = assembler.GenerateCode();