Always include debugger support.

src/x64/full-codegen-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 426 matching lines @@
     __ RecordJSReturn();
     // Do not use the leave instruction here because it is too short to
     // patch with the code required by the debugger.
     __ movp(rsp, rbp);
     __ popq(rbp);
     int no_frame_start = masm_->pc_offset();
 
     int arguments_bytes = (info_->scope()->num_parameters() + 1) * kPointerSize;
     __ Ret(arguments_bytes, rcx);
 
-#ifdef ENABLE_DEBUGGER_SUPPORT
     // Add padding that will be overwritten by a debugger breakpoint.  We
     // have just generated at least 7 bytes: "movp rsp, rbp; pop rbp; ret k"
     // (3 + 1 + 3) for x64 and at least 6 (2 + 1 + 3) bytes for x32.
     const int kPadding = Assembler::kJSReturnSequenceLength -
                          kPointerSize == kInt64Size ? 7 : 6;
     for (int i = 0; i < kPadding; ++i) {
       masm_->int3();
     }
     // Check that the size of the code used for returning is large enough
     // for the debugger's requirements.
     ASSERT(Assembler::kJSReturnSequenceLength <=
            masm_->SizeOfCodeGeneratedSince(&check_exit_codesize));
-#endif
+
     info_->AddNoFrameRange(no_frame_start, masm_->pc_offset());
   }
 }
 
 
 void FullCodeGenerator::EffectContext::Plug(Variable* var) const {
   ASSERT(var->IsStackAllocated() || var->IsContextSlot());
 }
 
 
@@ skipping 4458 matching lines @@
   ASSERT_EQ(isolate->builtins()->OsrAfterStackCheck()->entry(),
             Assembler::target_address_at(call_target_address,
                                          unoptimized_code));
   return OSR_AFTER_STACK_CHECK;
 }
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_X64