[compiler] Fix flipped boolean checks in marked tier-up

test/mjsunit/shared-function-tier-up-turbo.js

+// Copyright 2016 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: --mark-shared-functions-for-tier-up --allow-natives-syntax --ignition-staging --turbo
+
+(function() {
+  var sum = 0;
+  var i = 0;
+  for (var i = 0; i < 3; ++i) {
+    var f = function(x) {
+      return 2 * x;
+    }
+    sum += f(i);
+
+    if (%GetOptimizationStatus(f) == 3 || %GetOptimizationStatus(f) == 4) {
+      // If we are always or never optimizing f, just exit, this test is useless.
+      return;
+    }
+
+    if (i == 1) {
+      // f must be interpreted code.
+      assertEquals(8, %GetOptimizationStatus(f));
+
+      // Run twice (i = 0, 1), then tier-up.
+      %OptimizeFunctionOnNextCall(f);
+    } else if (i == 2) {
+      // Tier-up at i = 2 should go up to turbofan.
+      assertEquals(7, %GetOptimizationStatus(f));
+    }
+  }
+})()