[turbofan] Drop V8_TURBOFAN_BACKEND and V8_TURBOFAN_TARGET defines.

test/cctest/compiler/test-basic-block-profiler.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 "src/basic-block-profiler.h"
 #include "test/cctest/cctest.h"
 #include "test/cctest/compiler/codegen-tester.h"
 
-#if V8_TURBOFAN_TARGET
-
 using namespace v8::internal;
 using namespace v8::internal::compiler;
 
 typedef RawMachineAssembler::Label MLabel;
 
 class BasicBlockProfilerTest : public RawMachineAssemblerTester<int32_t> {
  public:
   BasicBlockProfilerTest() : RawMachineAssemblerTester<int32_t>(kMachInt32) {
     FLAG_turbo_profiling = true;
   }
@@ skipping 80 matching lines @@
   }
 
   uint32_t runs[] = {0, 1, 500, 10000};
   for (size_t i = 0; i < arraysize(runs); i++) {
     m.ResetCounts();
     CHECK_EQ(1, m.Call(static_cast<int>(runs[i])));
     uint32_t expected[] = {1, runs[i] + 1, runs[i], 1};
     m.Expect(arraysize(expected), expected);
   }
 }
-
-#endif  // V8_TURBOFAN_TARGET