[turbofan] Drop V8_TURBOFAN_BACKEND and V8_TURBOFAN_TARGET defines.

test/cctest/compiler/test-run-deopt.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/cctest.h"
 #include "test/cctest/compiler/function-tester.h"
 
 using namespace v8::internal;
 using namespace v8::internal::compiler;
 
-#if V8_TURBOFAN_TARGET
-
 static void IsOptimized(const v8::FunctionCallbackInfo<v8::Value>& args) {
   JavaScriptFrameIterator it(CcTest::i_isolate());
   JavaScriptFrame* frame = it.frame();
   return args.GetReturnValue().Set(frame->is_optimized());
 }
 
 
 static void InstallIsOptimizedHelper(v8::Isolate* isolate) {
   v8::Local<v8::Context> context = isolate->GetCurrentContext();
   v8::Local<v8::FunctionTemplate> t =
@@ skipping 71 matching lines @@
       "  }"
       "})");
 
   CompileRun("function DeoptAndThrow(f) { %DeoptimizeFunction(f); throw 0; }");
   InstallIsOptimizedHelper(CcTest::isolate());
 #if 0  // TODO(4195,mstarzinger): Reproduces on MIPS64, re-enable once fixed.
   T.CheckCall(T.false_value());
 #endif
 }
 
-#endif
 
 TEST(DeoptTrivial) {
   FLAG_allow_natives_syntax = true;
 
   FunctionTester T(
       "(function foo() {"
       "  %DeoptimizeFunction(foo);"
       "  return 1;"
       "})");
 
   T.CheckCall(T.Val(1));
 }