[ic] Record call counts for monomorphic calls made with an IC.

test/mjsunit/call-counts.js

Index: test/mjsunit/call-counts.js
diff --git a/test/mjsunit/call-counts.js b/test/mjsunit/call-counts.js
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+// Copyright 2015 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 --noalways-opt
+
+// Locations in the type feedback vector where call counts are maintained for
+// the two calls made from bar();
+const kFooCallExtraIndex = 5;
+const kArrayCallExtraIndex = 9;
+
+function GetCallCount(func, slot) {
+  var vector = %GetTypeFeedbackVector(func);
+  // Call counts are recorded doubled.
+  var value = %FixedArrayGet(vector, slot);
+  return Math.floor(value / 2);
+}
+
+function foo(a) { return a[3] * 16; }
+
+function bar(a) {
+  var result = 0;
+  for (var i = 0; i < 10; i++) {
+    result = foo(a);
+    if (i % 2 === 0) {
+      var r = Array();
+      r[0] = 1;
+      result += r[0];
+    }
+  }
+  return result;
+}
+
+var a = [1, 2, 3];
+bar(a);
+assertEquals(10, GetCallCount(bar, kFooCallExtraIndex));
+assertEquals(5, GetCallCount(bar, kArrayCallExtraIndex));
+
+%OptimizeFunctionOnNextCall(bar);
+bar(a);