Fix Math.round/floor that had bogus Smi representation

test/mjsunit/regress/regress-crbug-272564.js

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 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
 // Flags: --allow-natives-syntax
 
-"use strict";
-
-function f(a, b) {
-  return g("c", "d");
+function Bb(w) {
+  this.width = w;
 }
 
-function g(a, b) {
-  g.constructor.apply(this, arguments);
+function ce(a, b) {
+  "number" == typeof a && (a = (b ? Math.round(a) : a) + "px");
+  return a
 }
 
-g.constructor = function(a, b) {
-  assertEquals("c", a);
-  assertEquals("d", b);
+function pe(a, b, c) {
+  if (b instanceof Bb) b = b.width;
+  a.width = ce(b, !0);
 }
 
-f("a", "b");
-f("a", "b");
-%OptimizeFunctionOnNextCall(f);
-f("a", "b");
-g.x = "deopt";
-f("a", "b");
+var a = new Bb(1);
+var b = new Bb(5);
+pe(a, b, 0);
+pe(a, b, 0);
+%OptimizeFunctionOnNextCall(pe);
+pe(a, b, 0);