[turbofan] Drop V8_TURBOFAN_BACKEND and V8_TURBOFAN_TARGET defines.

test/cctest/compiler/codegen-tester.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/codegen-tester.h"
 #include "test/cctest/compiler/value-helper.h"
 
@@ skipping 350 matching lines @@
     RawMachineAssemblerTester<int32_t>* m) {
   FOR_UINT32_INPUTS(i) {
     input_b = *i;
     int32_t expect = gen->expected(input_a, input_b);
     if (false) printf("  cmp(a=%d, b=%d) ?== %d\n", input_a, input_b, expect);
     CHECK_EQ(expect, m->Call(input_a, input_b));
   }
 }
 
 
-#if V8_TURBOFAN_TARGET
-
 TEST(ParametersEqual) {
   RawMachineAssemblerTester<int32_t> m(kMachInt32, kMachInt32);
   Node* p1 = m.Parameter(1);
   CHECK(p1);
   Node* p0 = m.Parameter(0);
   CHECK(p0);
   CHECK_EQ(p0, m.Parameter(0));
   CHECK_EQ(p1, m.Parameter(1));
 }
 
@@ skipping 182 matching lines @@
   }
 
   {
     RawMachineAssemblerTester<int32_t> m;
     Float64BinopTester bt(&m);
     bt.AddReturn(bt.param1);
 
     FOR_FLOAT64_INPUTS(i) { CheckDoubleEq(*i, bt.call(-11.25, *i)); }
   }
 }
-
-#endif  // V8_TURBOFAN_TARGET