Always include debugger support.

src/x64/debug-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 19 matching lines @@
 #if V8_TARGET_ARCH_X64
 
 #include "assembler.h"
 #include "codegen.h"
 #include "debug.h"
 
 
 namespace v8 {
 namespace internal {
 
-#ifdef ENABLE_DEBUGGER_SUPPORT
-
 bool BreakLocationIterator::IsDebugBreakAtReturn()  {
   return Debug::IsDebugBreakAtReturn(rinfo());
 }
 
 
 // Patch the JS frame exit code with a debug break call. See
 // CodeGenerator::VisitReturnStatement and VirtualFrame::Exit in codegen-x64.cc
 // for the precise return instructions sequence.
 void BreakLocationIterator::SetDebugBreakAtReturn()  {
   ASSERT(Assembler::kJSReturnSequenceLength >= Assembler::kCallSequenceLength);
@@ skipping 289 matching lines @@
   __ leap(rdx, FieldOperand(rdx, Code::kHeaderSize));
 
   // Re-run JSFunction, rdi is function, rsi is context.
   __ jmp(rdx);
 }
 
 const bool Debug::kFrameDropperSupported = true;
 
 #undef __
 
-#endif  // ENABLE_DEBUGGER_SUPPORT
-
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_X64