[turbofan] Enable concurrent (re)compilation.

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/ast/ast-numbering.h"
 #include "src/ast/scopes.h"
 #include "src/compiler.h"
@@ skipping 176 matching lines @@
     }
     if (flags_ & CompilationInfo::kInliningEnabled) {
       info.MarkAsInliningEnabled();
     }
     if (function->shared()->HasBytecodeArray()) {
       info.MarkAsOptimizeFromBytecode();
     }
     CHECK(Compiler::Analyze(info.parse_info()));
     CHECK(Compiler::EnsureDeoptimizationSupport(&info));
 
-    Pipeline pipeline(&info);
-    Handle<Code> code = pipeline.GenerateCode();
+    Handle<Code> code = Pipeline::GenerateCodeForTesting(&info);
     CHECK(!code.is_null());
     info.dependencies()->Commit(code);
     info.context()->native_context()->AddOptimizedCode(*code);
     function->ReplaceCode(*code);
     return function;
   }
 
   std::string BuildFunction(int param_count) {
     std::string function_string = "(function(";
     if (param_count > 0) {
@@ skipping 28 matching lines @@
     CHECK(!code.is_null());
     function->ReplaceCode(*code);
     return function;
   }
 };
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_CCTEST_COMPILER_FUNCTION_TESTER_H_