Always include debugger support.

src/x64/builtins-x64.cc

 // Copyright 2012 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 145 matching lines @@
 
     // Push the function to invoke on the stack.
     __ Push(rdi);
 
     // 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;
 
-#ifdef ENABLE_DEBUGGER_SUPPORT
       ExternalReference debug_step_in_fp =
           ExternalReference::debug_step_in_fp_address(masm->isolate());
       __ Move(kScratchRegister, debug_step_in_fp);
       __ cmpp(Operand(kScratchRegister, 0), Immediate(0));
       __ j(not_equal, &rt_call);
-#endif
 
       // Verified that the constructor is a JSFunction.
       // Load the initial map and verify that it is in fact a map.
       // rdi: constructor
       __ movp(rax, FieldOperand(rdi, JSFunction::kPrototypeOrInitialMapOffset));
       // Will both indicate a NULL and a Smi
       ASSERT(kSmiTag == 0);
       __ JumpIfSmi(rax, &rt_call);
       // rdi: constructor
       // rax: initial map (if proven valid below)
@@ skipping 1347 matching lines @@
   __ bind(&ok);
   __ ret(0);
 }
 
 
 #undef __
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_X64