Fix X64 build in the case that debugger support is disabled. Change function...

src/x64/debug-x64.cc

 // Copyright 2009 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 21 matching lines @@
 #include "debug.h"
 
 
 namespace v8 {
 namespace internal {
 
 #ifdef ENABLE_DEBUGGER_SUPPORT
 
 bool Debug::IsDebugBreakAtReturn(v8::internal::RelocInfo* rinfo) {
   ASSERT(RelocInfo::IsJSReturn(rinfo->rmode()));
-  // 11th byte of patch is 0x49 (REX.WB byte of computed jump/call to r10),
-  // 11th byte of JS return is 0xCC (int3).
-  ASSERT(*(rinfo->pc() + 10) == 0x49 || *(rinfo->pc() + 10) == 0xCC);
-  return (*(rinfo->pc() + 10) != 0xCC);
+  return rinfo->IsPatchedReturnSequence();
 }
 
 #define __ ACCESS_MASM(masm)
 
 static void Generate_DebugBreakCallHelper(MacroAssembler* masm,
                                           RegList pointer_regs,
                                           bool convert_call_to_jmp) {
   // Save the content of all general purpose registers in memory. This copy in
   // memory is later pushed onto the JS expression stack for the fake JS frame
   // generated and also to the C frame generated on top of that. In the JS
@@ skipping 139 matching lines @@
 
 void BreakLocationIterator::SetDebugBreakAtReturn()  {
   ASSERT(Debug::kX64JSReturnSequenceLength >= Debug::kX64CallInstructionLength);
   rinfo()->PatchCodeWithCall(Debug::debug_break_return()->entry(),
       Debug::kX64JSReturnSequenceLength - Debug::kX64CallInstructionLength);
 }
 
 #endif  // ENABLE_DEBUGGER_SUPPORT
 
 } }  // namespace v8::internal