X64: Move some methods in x64/ to their file and make codegen do int3.

src/x64/debug-x64.cc

 // Copyright 2009 the V8 project authors. All rights reserved.
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 // modification, are permitted provided that the following conditions are
 // met:
 //
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 //       notice, this list of conditions and the following disclaimer.
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 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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+
+#include "v8.h"
+
+#include "codegen-inl.h"
+#include "debug.h"
+
+
+namespace v8 { namespace internal {
+
+#ifdef ENABLE_DEBUGGER_SUPPORT
+
+bool Debug::IsDebugBreakAtReturn(v8::internal::RelocInfo* rinfo) {
+  UNIMPLEMENTED();
+  return false;
+}
+
+void Debug::GenerateCallICDebugBreak(MacroAssembler* masm) {
+  masm->int3();  // UNIMPLEMENTED
+}
+
+void Debug::GenerateConstructCallDebugBreak(MacroAssembler* masm) {
+  masm->int3();  // UNIMPLEMENTED
+}
+
+void Debug::GenerateKeyedLoadICDebugBreak(MacroAssembler* masm) {
+  masm->int3();  // UNIMPLEMENTED
+}
+
+void Debug::GenerateKeyedStoreICDebugBreak(MacroAssembler* masm) {
+  masm->int3();  // UNIMPLEMENTED
+}
+
+void Debug::GenerateLoadICDebugBreak(MacroAssembler* masm) {
+  masm->int3();  // UNIMPLEMENTED
+}
+
+void Debug::GenerateReturnDebugBreak(MacroAssembler* masm) {
+  masm->int3();  // UNIMPLEMENTED
+}
+
+void Debug::GenerateReturnDebugBreakEntry(MacroAssembler* masm) {
+  masm->int3();  // UNIMPLEMENTED
+}
+
+void Debug::GenerateStoreICDebugBreak(MacroAssembler* masm) {
+  masm->int3();  // UNIMPLEMENTED
+}
+
+void Debug::GenerateStubNoRegistersDebugBreak(MacroAssembler* masm) {
+  masm->int3();  // UNIMPLEMENTED
+}
+
+#endif  // ENABLE_DEBUGGER_SUPPORT
+
+} }  // namespace v8::internal