Removing redundant stub for runtime native calls.

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 50 matching lines @@
   // Store the registers containing object pointers on the expression stack to
   // make sure that these are correctly updated during GC.
   __ PushRegistersFromMemory(pointer_regs);
 
 #ifdef DEBUG
   __ RecordComment("// Calling from debug break to runtime - come in - over");
 #endif
   __ xor_(rax, rax);  // No arguments (argc == 0).
   __ movq(rbx, ExternalReference::debug_break());
 
-  CEntryDebugBreakStub ceb;
+  CEntryStub ceb(1);
   __ CallStub(&ceb);
 
   // Restore the register values containing object pointers from the expression
   // stack in the reverse order as they where pushed.
   __ PopRegistersToMemory(pointer_regs);
 
   // Get rid of the internal frame.
   __ LeaveInternalFrame();
 
   // If this call did not replace a call but patched other code then there will
@@ skipping 111 matching lines @@
 void BreakLocationIterator::SetDebugBreakAtReturn()  {
   ASSERT(Assembler::kJSReturnSequenceLength >=
          Assembler::kCallInstructionLength);
   rinfo()->PatchCodeWithCall(Debug::debug_break_return()->entry(),
       Assembler::kJSReturnSequenceLength - Assembler::kCallInstructionLength);
 }
 
 #endif  // ENABLE_DEBUGGER_SUPPORT
 
 } }  // namespace v8::internal