fix bug with reducing f()|0|const

tools/js-optimizer.js

@@ -459,7 +459,7 @@ function simplifyExpressionsPre(ast) {
               go = true;
             }
             if (!go) {
-              stack.push(2);
+              stack.push(1);
               return;
             }
             // We might be able to remove this correction

tools/test-js-optimizer-asm-pre-output.js

@@ -18,6 +18,7 @@ function a() {
   f(g() | 0);
   f(g() | 0 & -1);
   f((g() | 0) >> 2);
+  $56 = _fcntl() | 0 | 1;
 }
 function b($this, $__n) {
   $this = $this | 0;

tools/test-js-optimizer-asm-pre.js

@@ -19,6 +19,7 @@ function a() {
   f(g() | 0 | 0);
   f(g() | 0 & -1);
   f((g() | 0) >> 2);
+  $56 = (_fcntl() | 0) | 1;
 }
 function b($this, $__n) {
   $this = $this | 0;