Clean up some random TODO(titzer)s and spelling mistakes.

src/compiler/simplified-operator.cc

Index: src/compiler/simplified-operator.cc
diff --git a/src/compiler/simplified-operator.cc b/src/compiler/simplified-operator.cc
index 31fdc3936fe35f8d66683304a5cee058a4828605..c7abe9c96ecd3a5d890b7e5999728f7e41cd2c76 100644
--- a/src/compiler/simplified-operator.cc
+++ b/src/compiler/simplified-operator.cc
@@ -254,7 +254,6 @@ NO_THROW_OP_LIST(GET_FROM_CACHE)
 
 
 const Operator* SimplifiedOperatorBuilder::ReferenceEqual(Type* type) {
-  // TODO(titzer): What about the type parameter?
   return new (zone()) Operator(IrOpcode::kReferenceEqual,
                                Operator::kCommutative | Operator::kPure,
                                "ReferenceEqual", 2, 0, 0, 1, 0, 0);