Revert of Remove obsolete JSFunction::IsOptimizable predicate.

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 377 matching lines @@
                "var closure0 = MakeClosure();"
                "%DebugPrint(closure0());"
                "%OptimizeFunctionOnNextCall(closure0);"
                "%DebugPrint(closure0());"
                "var closure1 = MakeClosure();"
                "var closure2 = MakeClosure();");
     Handle<JSFunction> fun1 = v8::Utils::OpenHandle(
         *v8::Local<v8::Function>::Cast(env->Global()->Get(v8_str("closure1"))));
     Handle<JSFunction> fun2 = v8::Utils::OpenHandle(
         *v8::Local<v8::Function>::Cast(env->Global()->Get(v8_str("closure2"))));
-    CHECK(fun1->IsOptimized() || !CcTest::i_isolate()->use_crankshaft());
-    CHECK(fun2->IsOptimized() || !CcTest::i_isolate()->use_crankshaft());
+    CHECK(fun1->IsOptimized()
+          || !CcTest::i_isolate()->use_crankshaft() || !fun1->IsOptimizable());
+    CHECK(fun2->IsOptimized()
+          || !CcTest::i_isolate()->use_crankshaft() || !fun2->IsOptimizable());
     CHECK_EQ(fun1->code(), fun2->code());
   }
 }
 
 
 TEST(CompileFunctionInContext) {
   CcTest::InitializeVM();
   v8::HandleScope scope(CcTest::isolate());
   LocalContext env;
   CompileRun("var r = 10;");
@@ skipping 147 matching lines @@
   CompileRun("function f() { a = 12345678 }; f();");
   CheckCodeForUnsafeLiteral(GetJSFunction(context->Global(), "f"));
   CompileRun("function f(x) { a = 12345678 + x}; f(1);");
   CheckCodeForUnsafeLiteral(GetJSFunction(context->Global(), "f"));
   CompileRun("function f(x) { var arguments = 1; x += 12345678}; f(1);");
   CheckCodeForUnsafeLiteral(GetJSFunction(context->Global(), "f"));
   CompileRun("function f(x) { var arguments = 1; x = 12345678}; f(1);");
   CheckCodeForUnsafeLiteral(GetJSFunction(context->Global(), "f"));
 }
 #endif