[turbofan] Context specialize during inlining.

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 490 matching lines @@
       "  function bar() { return foo(); };"
       "  %SetInlineBuiltinFlag(foo);"
       "  return bar;"
       "})();",
       kBuiltinInlineFlags);
 
   InstallAssertInlineCountHelper(CcTest::isolate());
   T.CheckCall(T.true_value());
 }
 
+
+TEST(InlineNestedBuiltin) {
+  FLAG_turbo_deoptimization = true;
+  FunctionTester T(
+      "(function () {"
+      "  function foo(s,t,u) { AssertInlineCount(3); return true; }"
+      "  function baz(s,t,u) { return foo(s,t,u); }"
+      "  function bar() { return baz(); };"
+      "  %SetInlineBuiltinFlag(foo);"
+      "  %SetInlineBuiltinFlag(baz);"
+      "  return bar;"
+      "})();",
+      kBuiltinInlineFlags);
+
+  InstallAssertInlineCountHelper(CcTest::isolate());
+  T.CheckCall(T.true_value());
+}
+
 #endif  // V8_TURBOFAN_TARGET