[crankshaft] Use canonical nan_value or minus_zero_value objects instead of constant heap numbers w…

test/mjsunit/regress/regress-crbug-625547.js

 // Copyright 2016 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: --turbo-filter=* --allow-natives-syntax
+// Flags: --allow-natives-syntax --expose-gc
 
 var v1 = {};
-function g() {
-  v1 = [];
-  for (var i = 0; i < 1; i++) {
-    v1[i]();
-  }
-}
+v1 = 0;
+var v2 = {};
+v2 = 0;
+gc();
 
-var v2 = {};
-var v3 = {};
+var minus_zero = {z:-0.0}.z;
+var nan = undefined + 1;
 function f() {
-  v3 = v2;
-  g();
-}
-
-assertThrows(g);
+  v1 = minus_zero;
+  v2 = nan;
+};
 %OptimizeFunctionOnNextCall(f);
-assertThrows(f);
+f();
+gc();  // Boom!