Tweak minus zero detect of HChange

test/mjsunit/compiler/minus-zero.js

Index: test/mjsunit/compiler/minus-zero.js
diff --git a/test/mjsunit/compiler/minus-zero.js b/test/mjsunit/compiler/minus-zero.js
index c161257d77a838b1d81b3454ae5d30b0a33b6425..e563a78433c89436633a84633fd0939f1dc81b0c 100644
--- a/test/mjsunit/compiler/minus-zero.js
+++ b/test/mjsunit/compiler/minus-zero.js
@@ -91,3 +91,15 @@ assertEquals(1, 1/add(double_one, 0));
 assertEquals(1, 1/add(0, double_one));
 %OptimizeFunctionOnNextCall(add);
 assertEquals(1/(-0 + -0), 1/add(-0, -0));
+
+
+function foo(x, y, z) {
+  var w = x * y;
+  return w + z;
+}
+
+assertEquals(1, foo(0, 1, 1));
+assertEquals(1, foo(0, 1, 1));
+%OptimizeFunctionOnNextCall(foo);
+assertEquals(1, foo(0, -1, 1));
+assertOptimized(foo);