Always include debugger support.

src/arm64/builtins-arm64.cc

 // Copyright 2013 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 352 matching lines @@
     __ SmiTag(argc);
     __ Push(argc, constructor);
     // sp[0] : Constructor function.
     // sp[1]: number of arguments (smi-tagged)
 
     // Try to allocate the object without transitioning into C code. If any of
     // the preconditions is not met, the code bails out to the runtime call.
     Label rt_call, allocated;
     if (FLAG_inline_new) {
       Label undo_allocation;
-#if ENABLE_DEBUGGER_SUPPORT
       ExternalReference debug_step_in_fp =
           ExternalReference::debug_step_in_fp_address(isolate);
       __ Mov(x2, Operand(debug_step_in_fp));
       __ Ldr(x2, MemOperand(x2));
       __ Cbnz(x2, &rt_call);
-#endif
       // Load the initial map and verify that it is in fact a map.
       Register init_map = x2;
       __ Ldr(init_map,
              FieldMemOperand(constructor,
                              JSFunction::kPrototypeOrInitialMapOffset));
       __ JumpIfSmi(init_map, &rt_call);
       __ JumpIfNotObjectType(init_map, x10, x11, MAP_TYPE, &rt_call);
 
       // Check that the constructor is not constructing a JSFunction (see
       // comments in Runtime_NewObject in runtime.cc). In which case the initial
@@ skipping 1195 matching lines @@
     __ Unreachable();
   }
 }
 
 
 #undef __
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_ARM