[turbofan] Collect invocation counts and compute relative call frequencies.

test/cctest/test-compiler.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 824 matching lines @@
   CHECK_NE(*isolate->builtins()->InterpreterEntryTrampoline(), f1->code());
   CHECK_EQ(*isolate->builtins()->InterpreterEntryTrampoline(), f2->code());
   CHECK_EQ(23.0, GetGlobalProperty("result1")->Number());
 
   // Function {f2} will self-heal now.
   CompileRun("var result2 = f2()");
   CHECK_NE(*isolate->builtins()->InterpreterEntryTrampoline(), f1->code());
   CHECK_NE(*isolate->builtins()->InterpreterEntryTrampoline(), f2->code());
   CHECK_EQ(23.0, GetGlobalProperty("result2")->Number());
 }
+
+TEST(InvocationCount) {
+  FLAG_allow_natives_syntax = true;
+  FLAG_always_opt = false;
+  CcTest::InitializeVM();
+  v8::HandleScope scope(CcTest::isolate());
+
+  CompileRun(
+      "function bar() {};"
+      "function foo() { return bar(); };"
+      "foo();");
+  Handle<JSFunction> foo = Handle<JSFunction>::cast(GetGlobalProperty("foo"));
+  CHECK_EQ(1, foo->feedback_vector()->invocation_count());
+  CompileRun("foo()");
+  CHECK_EQ(2, foo->feedback_vector()->invocation_count());
+  CompileRun("bar()");
+  CHECK_EQ(2, foo->feedback_vector()->invocation_count());
+  CompileRun("foo(); foo()");
+  CHECK_EQ(4, foo->feedback_vector()->invocation_count());
+  CompileRun("%BaselineFunctionOnNextCall(foo);");
+  CompileRun("foo();");
+  CHECK_EQ(5, foo->feedback_vector()->invocation_count());
+}