Custom call IC-s for String.prototype.{charAt,charCodeAt}.

src/x64/stub-cache-x64.cc

Index: src/x64/stub-cache-x64.cc
diff --git a/src/x64/stub-cache-x64.cc b/src/x64/stub-cache-x64.cc
index ac7d33159d08b4ec4c82c6d498de6b7a13ab2d5d..5debd826647fa4265d92730c6c67c6d3461b7efe 100644
--- a/src/x64/stub-cache-x64.cc
+++ b/src/x64/stub-cache-x64.cc
@@ -1305,6 +1305,25 @@ Object* CallStubCompiler::CompileArrayPopCall(Object* object,
 }
 
 
+Object* CallStubCompiler::CompileStringCharAtCall(Object* object,
+                                                  JSObject* holder,
+                                                  JSFunction* function,
+                                                  String* name,
+                                                  CheckType check) {
+  // TODO(<bug>): implement this.
+  return Heap::undefined_value();
+}
+
+
+Object* CallStubCompiler::CompileStringCharCodeAtCall(Object* object,
+                                                      JSObject* holder,
+                                                      JSFunction* function,
+                                                      String* name,
+                                                      CheckType check) {
+  // TODO(<bug>): implement this.
+  return Heap::undefined_value();
+}
+
 
 
 Object* CallStubCompiler::CompileCallInterceptor(JSObject* object,