[turbofan] NaN is never truish.

test/mjsunit/compiler/regress-4207.js

Index: test/mjsunit/compiler/regress-4207.js
diff --git a/test/mjsunit/regress/regress-crbug-500435.js b/test/mjsunit/compiler/regress-4207.js
similarity index 53%
copy from test/mjsunit/regress/regress-crbug-500435.js
copy to test/mjsunit/compiler/regress-4207.js
index acc17ac5ecce8eaa9d2c384e984c3464b80797f4..c4ab5a78372b822cfb6eefa8385162e9862637ce 100644
--- a/test/mjsunit/regress/regress-crbug-500435.js
+++ b/test/mjsunit/compiler/regress-4207.js
@@ -4,19 +4,12 @@
 
 // Flags: --allow-natives-syntax
 
-function bar(a) {
-  delete a[1];
-}
+function bar() { return 0/0 && 1; }
+assertEquals(NaN, bar());
+%OptimizeFunctionOnNextCall(bar);
+assertEquals(NaN, bar());
 
-function foo(a) {
-  var d;
-  for (d in a) {
-    assertFalse(d === undefined);
-    bar(a);
-  }
-}
-
-foo([1,2]);
-foo([2,3]);
+function foo() { return 0/0 || 1; }
+assertEquals(1, foo());
 %OptimizeFunctionOnNextCall(foo);
-foo([1,2]);
+assertEquals(1, foo());