[turbofan] Drop V8_TURBOFAN_BACKEND and V8_TURBOFAN_TARGET defines.

test/unittests/compiler/js-typed-lowering-unittest.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/code-factory.h"
 #include "src/compiler/access-builder.h"
 #include "src/compiler/js-graph.h"
 #include "src/compiler/js-operator.h"
 #include "src/compiler/js-typed-lowering.h"
 #include "src/compiler/machine-operator.h"
@@ skipping 986 matching lines @@
                           Type::Tagged(),
                           IsLoadContext(
                               ContextAccess(i, Context::EXTENSION_INDEX, false),
                               context),
                           IsNumberConstant(BitEq(0.0))),
                       control)),
                   _)));
   }
 }
 
-#if V8_TURBOFAN_TARGET
 
 // -----------------------------------------------------------------------------
 // JSAdd
 
 
 TEST_F(JSTypedLoweringTest, JSAddWithString) {
   TRACED_FOREACH(LanguageMode, language_mode, kLanguageModes) {
     Node* lhs = Parameter(Type::String(), 0);
     Node* rhs = Parameter(Type::String(), 1);
     Node* context = Parameter(Type::Any(), 2);
@@ skipping 79 matching lines @@
       javascript()->CreateLiteralObject(ObjectLiteral::kShallowProperties),
       input0, input1, input2, context, frame_state, effect, control));
   ASSERT_TRUE(r.Changed());
   EXPECT_THAT(
       r.replacement(),
       IsCall(_, IsHeapConstant(Unique<HeapObject>::CreateImmovable(
                     CodeFactory::FastCloneShallowObject(isolate(), 6).code())),
              input0, input1, input2, _, context, frame_state, effect, control));
 }
 
-#endif  // V8_TURBOFAN_TARGET
-
 
 // -----------------------------------------------------------------------------
 // JSCreateWithContext
 
 
 TEST_F(JSTypedLoweringTest, JSCreateWithContext) {
   FLAG_turbo_allocate = true;
   Node* const object = Parameter(Type::Receiver());
   Node* const closure = Parameter(Type::Any());
   Node* const context = Parameter(Type::Any());
   Node* const frame_state = EmptyFrameState();
   Node* const effect = graph()->start();
   Node* const control = graph()->start();
   Reduction r =
       Reduce(graph()->NewNode(javascript()->CreateWithContext(), object,
                               closure, context, frame_state, effect, control));
   ASSERT_TRUE(r.Changed());
   EXPECT_THAT(r.replacement(),
               IsFinish(IsAllocate(IsNumberConstant(Context::SizeFor(
                                       Context::MIN_CONTEXT_SLOTS)),
                                   effect, control),
                        _));
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8