[builtins] Introduce DeleteProperty builtin

src/full-codegen/x64/full-codegen-x64.cc

Index: src/full-codegen/x64/full-codegen-x64.cc
diff --git a/src/full-codegen/x64/full-codegen-x64.cc b/src/full-codegen/x64/full-codegen-x64.cc
index 5e9d52af380403144f8e8cf8aa51c989931437bd..1643007af94537150a0cb29d5b2ea772bbc128c9 100644
--- a/src/full-codegen/x64/full-codegen-x64.cc
+++ b/src/full-codegen/x64/full-codegen-x64.cc
@@ -2146,9 +2146,8 @@ void FullCodeGenerator::VisitUnaryOperation(UnaryOperation* expr) {
       if (property != NULL) {
         VisitForStackValue(property->obj());
         VisitForStackValue(property->key());
-        CallRuntimeWithOperands(is_strict(language_mode())
-                                    ? Runtime::kDeleteProperty_Strict
-                                    : Runtime::kDeleteProperty_Sloppy);
+        PushOperand(Smi::FromInt(language_mode()));
+        CallRuntimeWithOperands(Runtime::kDeleteProperty);
         context()->Plug(rax);
       } else if (proxy != NULL) {
         Variable* var = proxy->var();
@@ -2160,7 +2159,8 @@ void FullCodeGenerator::VisitUnaryOperation(UnaryOperation* expr) {
           __ movp(rax, NativeContextOperand());
           __ Push(ContextOperand(rax, Context::EXTENSION_INDEX));
           __ Push(var->name());
-          __ CallRuntime(Runtime::kDeleteProperty_Sloppy);
+          __ Push(Smi::FromInt(SLOPPY));
+          __ CallRuntime(Runtime::kDeleteProperty);
           context()->Plug(rax);
         } else {
           DCHECK(!var->IsLookupSlot());