[promises] Remove IsPromise

src/builtins/builtins-promise.cc

Index: src/builtins/builtins-promise.cc
diff --git a/src/builtins/builtins-promise.cc b/src/builtins/builtins-promise.cc
index c12d1ebc9e221c9330f7613294e17c1fa3be960f..bff20701d51a35aba738735f933d5fe276560f15 100644
--- a/src/builtins/builtins-promise.cc
+++ b/src/builtins/builtins-promise.cc
@@ -219,7 +219,6 @@ void Builtins::Generate_PromiseInternalConstructor(
   a.Return(instance);
 }
 
-// TODO(gsathya): Refactor promise.js::IsPromise to use this.
 void Builtins::Generate_IsPromise(compiler::CodeAssemblerState* state) {
   CodeStubAssembler a(state);
   typedef compiler::Node Node;