Replace custom builtin invocation instructions by a generic version

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 f7e006bcb2fcb022d227508c32227a9f30966416..b96dd76ca3a152d7d99dafb7df3fee0942fe6fd4 100644
--- a/src/x64/lithium-x64.cc
+++ b/src/x64/lithium-x64.cc
@@ -2366,14 +2366,6 @@ LInstruction* LChunkBuilder::DoFunctionLiteral(HFunctionLiteral* instr) {
 }
 
 
-LInstruction* LChunkBuilder::DoDeleteProperty(HDeleteProperty* instr) {
-  LOperand* object = UseAtStart(instr->object());
-  LOperand* key = UseOrConstantAtStart(instr->key());
-  LDeleteProperty* result = new(zone()) LDeleteProperty(object, key);
-  return MarkAsCall(DefineFixed(result, rax), instr);
-}
-
-
 LInstruction* LChunkBuilder::DoOsrEntry(HOsrEntry* instr) {
   ASSERT(argument_count_ == 0);
   allocator_->MarkAsOsrEntry();
@@ -2547,14 +2539,6 @@ LInstruction* LChunkBuilder::DoLeaveInlined(HLeaveInlined* instr) {
 }
 
 
-LInstruction* LChunkBuilder::DoIn(HIn* instr) {
-  LOperand* key = UseOrConstantAtStart(instr->key());
-  LOperand* object = UseOrConstantAtStart(instr->object());
-  LIn* result = new(zone()) LIn(key, object);
-  return MarkAsCall(DefineFixed(result, rax), instr);
-}
-
-
 LInstruction* LChunkBuilder::DoForInPrepareMap(HForInPrepareMap* instr) {
   LOperand* object = UseFixed(instr->enumerable(), rax);
   LForInPrepareMap* result = new(zone()) LForInPrepareMap(object);