[turbofan] Try hard(er) to use smi representation for float64 values.

test/mjsunit/regress/regress-460937.js

Index: test/mjsunit/regress/regress-460937.js
diff --git a/test/mjsunit/regress/regress-460937.js b/test/mjsunit/regress/regress-460937.js
deleted file mode 100644
index cd57f93328beb1e2bab4e814afb3445e6843abe0..0000000000000000000000000000000000000000
--- a/test/mjsunit/regress/regress-460937.js
+++ /dev/null
@@ -1,19 +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.
-
-// Flags: --allow-natives-syntax
-
-function f() {
-  var a = new Array(100000);
-  var i = 0;
-  while (!%HasFastDoubleElements(a)) {
-    a[i] = i;
-    i += 0.1;
-  }
-  a[1] = 1.5;
-}
-
-f();
-%OptimizeFunctionOnNextCall(f);
-f();