[builtins] Introduce DeleteProperty builtin

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

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #if V8_TARGET_ARCH_X64
 
 #include "src/assembler-inl.h"
 #include "src/ast/compile-time-value.h"
 #include "src/ast/scopes.h"
 #include "src/builtins/builtins-constructor.h"
@@ skipping 2128 matching lines @@
 void FullCodeGenerator::VisitUnaryOperation(UnaryOperation* expr) {
   switch (expr->op()) {
     case Token::DELETE: {
       Comment cmnt(masm_, "[ UnaryOperation (DELETE)");
       Property* property = expr->expression()->AsProperty();
       VariableProxy* proxy = expr->expression()->AsVariableProxy();
 
       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();
         // Delete of an unqualified identifier is disallowed in strict mode but
         // "delete this" is allowed.
         bool is_this = var->is_this();
         DCHECK(is_sloppy(language_mode()) || is_this);
         if (var->IsUnallocated()) {
           __ 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());
           DCHECK(var->IsStackAllocated() || var->IsContextSlot());
           // Result of deleting non-global variables is false.  'this' is
           // not really a variable, though we implement it as one.  The
           // subexpression does not have side effects.
           context()->Plug(is_this);
         }
       } else {
@@ skipping 567 matching lines @@
   DCHECK_EQ(
       isolate->builtins()->OnStackReplacement()->entry(),
       Assembler::target_address_at(call_target_address, unoptimized_code));
   return ON_STACK_REPLACEMENT;
 }
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_X64