Implement target cache for constructor calls.

src/x64/debug-x64.cc

 // Copyright 2011 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 217 matching lines @@
   Generate_DebugBreakCallHelper(masm, rcx.bit(), 0, false);
 }
 
 
 void Debug::GenerateConstructCallDebugBreak(MacroAssembler* masm) {
   // Register state just before return from JS function (from codegen-x64.cc).
   // rax is the actual number of arguments not encoded as a smi, see comment
   // above IC call.
   // ----------- S t a t e -------------
   //  -- rax: number of arguments
+  //  -- rbx: cache cell for call target
   // -----------------------------------
   // The number of arguments in rax is not smi encoded.
-  Generate_DebugBreakCallHelper(masm, rdi.bit(), rax.bit(), false);
+  Generate_DebugBreakCallHelper(masm, rbx.bit() | rdi.bit(), rax.bit(), false);
 }
 
 
 void Debug::GenerateReturnDebugBreak(MacroAssembler* masm) {
   // Register state just before return from JS function (from codegen-x64.cc).
   // ----------- S t a t e -------------
   //  -- rax: return value
   // -----------------------------------
   Generate_DebugBreakCallHelper(masm, rax.bit(), 0, true);
 }
 
 
 void Debug::GenerateCallFunctionStubDebugBreak(MacroAssembler* masm) {
-  // Register state for stub CallFunction (from CallFunctionStub in ic-x64.cc).
+  // Register state for CallFunctionStub (from code-stubs-x64.cc).
   // ----------- S t a t e -------------
   //  -- rdi : function
   // -----------------------------------
   Generate_DebugBreakCallHelper(masm, rdi.bit(), 0, false);
 }
 
 
 void Debug::GenerateSlot(MacroAssembler* masm) {
   // Generate enough nop's to make space for a call instruction.
   Label check_codesize;
@@ skipping 44 matching lines @@
 
 const bool Debug::kFrameDropperSupported = true;
 
 #undef __
 
 #endif  // ENABLE_DEBUGGER_SUPPORT
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_X64