x64: Fix LMathMinMax for constant Smi right-hand operands

test/mjsunit/regress/regress-crbug-349079.js

Index: test/mjsunit/regress/regress-crbug-349079.js
diff --git a/test/mjsunit/regress/regress-crbug-349079.js b/test/mjsunit/regress/regress-crbug-349079.js
new file mode 100644
index 0000000000000000000000000000000000000000..b1076ea435c7d1e66c7bb906bf718b1ba1dc2a7b
--- /dev/null
+++ b/test/mjsunit/regress/regress-crbug-349079.js
@@ -0,0 +1,23 @@
+// Copyright 2014 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 assertEquals(expected, found) {
+  return found === expected;
+};
+%NeverOptimizeFunction(assertEquals);
+
+function crash() {
+  var a = 1;
+  var b = -0;
+  var c = 1.5;
+  assertEquals(b, Math.max(b++, c++));
+  assertEquals(c, Math.min(b++, c++));
+  assertEquals(b, Math.max(b++, a++));
+}
+crash();
+crash();
+%OptimizeFunctionOnNextCall(crash);
+crash();