[turbofan] Remove the unused asm.js types from TypeCache.

src/type-cache.cc

Index: src/type-cache.cc
diff --git a/src/type-cache.cc b/src/type-cache.cc
deleted file mode 100644
index d05aaa1f4dd0f23b839db62f68f8ac60b657de79..0000000000000000000000000000000000000000
--- a/src/type-cache.cc
+++ /dev/null
@@ -1,23 +0,0 @@
-// Copyright 2015 the V8 project authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#include "src/type-cache.h"
-
-#include "src/base/lazy-instance.h"
-
-namespace v8 {
-namespace internal {
-
-namespace {
-
-base::LazyInstance<TypeCache>::type kCache = LAZY_INSTANCE_INITIALIZER;
-
-}  // namespace
-
-
-// static
-TypeCache const& TypeCache::Get() { return kCache.Get(); }
-
-}  // namespace internal
-}  // namespace v8