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

src/x64/virtual-frame-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 1059 matching lines @@
   b->Unuse();
 }
 
 
 Result VirtualFrame::CallLoadIC(RelocInfo::Mode mode) {
   // Name and receiver are on the top of the frame.  Both are dropped.
   // The IC expects name in rcx and receiver in rax.
   Handle<Code> ic(Builtins::builtin(Builtins::LoadIC_Initialize));
   Result name = Pop();
   Result receiver = Pop();
-  PrepareForCall(0, 0);  // One stack arg, not callee-dropped.
+  PrepareForCall(0, 0);
   MoveResultsToRegisters(&name, &receiver, rcx, rax);
 
   return RawCallCodeObject(ic, mode);
 }
 
 
 Result VirtualFrame::CallKeyedLoadIC(RelocInfo::Mode mode) {
   // Key and receiver are on top of the frame.  The IC expects them on
   // the stack.  It does not drop them.
   Handle<Code> ic(Builtins::builtin(Builtins::KeyedLoadIC_Initialize));
-  PrepareForCall(2, 0);  // Two stack args, neither callee-dropped.
+  Result name = Pop();
+  Result receiver = Pop();
+  PrepareForCall(0, 0);
+  MoveResultsToRegisters(&name, &receiver, rax, rdx);
   return RawCallCodeObject(ic, mode);
 }
 
 
 Result VirtualFrame::CallCommonStoreIC(Handle<Code> ic,
                                        Result* value,
                                        Result* key,
                                        Result* receiver) {
   // The IC expects value in rax, key in rcx, and receiver in rdx.
   PrepareForCall(0, 0);
@@ skipping 90 matching lines @@
   Adjust(kHandlerSize - 1);
   __ PushTryHandler(IN_JAVASCRIPT, type);
 }
 
 
 #undef __
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_X64