Change keyed load IC interface on x64 to pass arguments in registers.

src/x64/debug-x64.cc

 // Copyright 2010 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 106 matching lines @@
   //  -- rax: number of arguments
   // -----------------------------------
   // The number of arguments in rax is not smi encoded.
   Generate_DebugBreakCallHelper(masm, 0, false);
 }
 
 
 void Debug::GenerateKeyedLoadICDebugBreak(MacroAssembler* masm) {
   // Register state for keyed IC load call (from ic-x64.cc).
   // ----------- S t a t e -------------
-  //  No registers used on entry.
+  //  -- rax     : key
+  //  -- rdx     : receiver
   // -----------------------------------
-  Generate_DebugBreakCallHelper(masm, 0, false);
+  Generate_DebugBreakCallHelper(masm, rax.bit() | rdx.bit(), false);
 }
 
 
 void Debug::GenerateKeyedStoreICDebugBreak(MacroAssembler* masm) {
   // Register state for keyed IC load call (from ic-x64.cc).
   // ----------- S t a t e -------------
   //  -- rax    : value
   //  -- rcx    : key
   //  -- rdx    : receiver
   // -----------------------------------
@@ skipping 74 matching lines @@
          Assembler::kCallInstructionLength);
   rinfo()->PatchCodeWithCall(Debug::debug_break_return()->entry(),
       Assembler::kJSReturnSequenceLength - Assembler::kCallInstructionLength);
 }
 
 #endif  // ENABLE_DEBUGGER_SUPPORT
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_X64