Cleanup V8_TURBOFAN_TARGET definition.

src/compiler/arm64/instruction-selector-arm64.cc

Index: src/compiler/arm64/instruction-selector-arm64.cc
diff --git a/src/compiler/arm64/instruction-selector-arm64.cc b/src/compiler/arm64/instruction-selector-arm64.cc
index 30502441896f84b143a1830d35e13d05bebc915d..bd23dfd17e2a6fc9d7a85181df26f2c8a46a55c3 100644
--- a/src/compiler/arm64/instruction-selector-arm64.cc
+++ b/src/compiler/arm64/instruction-selector-arm64.cc
@@ -9,8 +9,6 @@ namespace v8 {
 namespace internal {
 namespace compiler {
 
-#if V8_TURBOFAN_TARGET
-
 enum ImmediateMode {
   kArithimeticImm,  // 12 bit unsigned immediate shifted left 0 or 12 bits
   kShift32Imm,      // 0 - 31
@@ -664,8 +662,6 @@ void InstructionSelector::VisitCall(Node* call, BasicBlock* continuation,
   }
 }
 
-#endif  // V8_TURBOFAN_TARGET
-
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8