Fix switch statements with non-Smi integer labels and no type feedback

test/mjsunit/regress/regress-crbug-329709.js

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 // Flags: --allow-natives-syntax
 
-function foo(x) {
-  var a = [1, 2, 3, 4, 5, 6, 7, 8];
-  a[x + 5];
-  var result;
-  for (var i = 0; i < 3; i++) {
-    result = a[0 - x];
+function boom(x) {
+  switch(x) {
+    case 1: return "one";
+    case 1500000000: return "non-smi int32";
+    default: return "default";
   }
-  return result;
 }
 
-foo(0);
-foo(0);
-%OptimizeFunctionOnNextCall(foo);
-var r = foo(-2);
-assertEquals(3, r);
+assertEquals("one", boom(1));
+assertEquals("one", boom(1));
+%OptimizeFunctionOnNextCall(boom)
+assertEquals("non-smi int32", boom(1500000000));