Deprecate HAllocateObject in favor of HAllocate.

src/x64/lithium-x64.cc

Index: src/x64/lithium-x64.cc
diff --git a/src/x64/lithium-x64.cc b/src/x64/lithium-x64.cc
index fe23709a8d8aa9e456acf63904731855fa23876b..44102a0fa0852722fd118394f6711ae751ed20f8 100644
--- a/src/x64/lithium-x64.cc
+++ b/src/x64/lithium-x64.cc
@@ -2328,13 +2328,6 @@ LInstruction* LChunkBuilder::DoStringLength(HStringLength* instr) {
 }
 
 
-LInstruction* LChunkBuilder::DoAllocateObject(HAllocateObject* instr) {
-  info()->MarkAsDeferredCalling();
-  LAllocateObject* result = new(zone()) LAllocateObject(TempRegister());
-  return AssignPointerMap(DefineAsRegister(result));
-}
-
-
 LInstruction* LChunkBuilder::DoAllocate(HAllocate* instr) {
   info()->MarkAsDeferredCalling();
   LOperand* size = instr->size()->IsConstant()