Canonicalize NaNs on store to Fast(Float|Double) arrays

test/mjsunit/regress/regress-2596.js

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 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
 // Flags: --allow-natives-syntax
 
-"use strict";
+var bytes = new Uint8Array([
+    0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x7f]);  // kHoleNaN
+var doubles = new Float64Array(bytes.buffer);
+assertTrue(isNaN(doubles[0]));
 
-function f(a, b) {
-  return g("c", "d");
+var prototype = [2.5, 2.5];
+var array = [3.5, 3.5];
+array.__proto__ = prototype;
+assertTrue(%HasFastDoubleElements(array));
+
+function boom(index) {
+  array[index] = doubles[0];
+  return array[index];
 }
 
-function g(a, b) {
-  g.constructor.apply(this, arguments);
-}
+assertTrue(isNaN(boom(0)));
+assertTrue(isNaN(boom(0)));
+assertTrue(isNaN(boom(0)));
 
-g.constructor = function(a, b) {
-  assertEquals("c", a);
-  assertEquals("d", b);
-}
+// Test hydrogen
+%OptimizeFunctionOnNextCall(boom);
+assertTrue(isNaN(boom(0)));
+assertTrue(isNaN(boom(0)));
+assertTrue(isNaN(boom(0)));
 
-f("a", "b");
-f("a", "b");
-%OptimizeFunctionOnNextCall(f);
-f("a", "b");
-g.x = "deopt";
-f("a", "b");
+
+