[turbofan] Add support for inlining of builtins.

test/cctest/compiler/function-tester.h

 // 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.
 
 #ifndef V8_CCTEST_COMPILER_FUNCTION_TESTER_H_
 #define V8_CCTEST_COMPILER_FUNCTION_TESTER_H_
 
 #include "src/v8.h"
 #include "test/cctest/cctest.h"
 
@@ skipping 16 matching lines @@
 namespace compiler {
 
 class FunctionTester : public InitializedHandleScope {
  public:
   explicit FunctionTester(const char* source, uint32_t flags = 0)
       : isolate(main_isolate()),
         function((FLAG_allow_natives_syntax = true, NewFunction(source))),
         flags_(flags) {
     Compile(function);
     const uint32_t supported_flags = CompilationInfo::kContextSpecializing |
+                                     CompilationInfo::kBuiltinInliningEnabled |
                                      CompilationInfo::kInliningEnabled |
                                      CompilationInfo::kTypingEnabled;
     CHECK_EQ(0u, flags_ & ~supported_flags);
   }
 
   explicit FunctionTester(Graph* graph)
       : isolate(main_isolate()),
         function(NewFunction("(function(a,b){})")),
         flags_(0) {
     CompileGraph(graph);
@@ skipping 173 matching lines @@
     CHECK(!code.is_null());
     function->ReplaceCode(*code);
     return function;
   }
 };
 }
 }
 }  // namespace v8::internal::compiler
 
 #endif  // V8_CCTEST_COMPILER_FUNCTION_TESTER_H_