[turbofan] Use Start as sentinel for frame states.

test/cctest/compiler/test-run-inlining.cc

 // Copyright 2014 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.
 
 #include "src/v8.h"
 
 #include "test/cctest/compiler/function-tester.h"
 
 #if V8_TURBOFAN_TARGET
 
@@ skipping 60 matching lines @@
       "  function bar(s, t) { return foo(s); };"
       "  return bar;"
       "})();",
       kInlineFlags);
 
   InstallAssertInlineCountHelper(CcTest::isolate());
   T.CheckCall(T.Val(1), T.Val(1), T.Val(2));
 }
 
 
+TEST(SimpleInliningDeoptSelf) {
+  FunctionTester T(
+      "(function(){"
+      "  function foo(s) { %_DeoptimizeNow(); return s; };"
+      "  function bar(s, t) { return foo(s); };"
+      "  return bar;"
+      "})();",
+      kInlineFlags);
+
+  InstallAssertInlineCountHelper(CcTest::isolate());
+  T.CheckCall(T.Val(1), T.Val(1), T.Val(2));
+}
+
+
 TEST(SimpleInliningContext) {
   FunctionTester T(
       "(function () {"
       "  function foo(s) { AssertInlineCount(2); var x = 12; return s + x; };"
       "  function bar(s, t) { return foo(s); };"
       "  return bar;"
       "})();",
       kInlineFlags);
 
   InstallAssertInlineCountHelper(CcTest::isolate());
@@ skipping 427 matching lines @@
       "  'use strong';"
       "  function foo(x, y) { return x; }"
       "  function bar(x, y) { return foo(x); }"
       "  return bar;"
       "})();",
       kInlineFlags);
   T.CheckThrows(T.undefined(), T.undefined());
 }
 
 #endif  // V8_TURBOFAN_TARGET