[builtins] Introduce DeleteProperty builtin

src/crankshaft/hydrogen.cc

 // Copyright 2013 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.
 
 #include "src/crankshaft/hydrogen.h"
 
 #include <memory>
 #include <sstream>
 
 #include "src/allocation-site-scopes.h"
@@ skipping 9995 matching lines @@
 
 
 void HOptimizedGraphBuilder::VisitDelete(UnaryOperation* expr) {
   Property* prop = expr->expression()->AsProperty();
   VariableProxy* proxy = expr->expression()->AsVariableProxy();
   if (prop != NULL) {
     CHECK_ALIVE(VisitForValue(prop->obj()));
     CHECK_ALIVE(VisitForValue(prop->key()));
     HValue* key = Pop();
     HValue* obj = Pop();
-    Add<HPushArguments>(obj, key);
-    HInstruction* instr = New<HCallRuntime>(
-        Runtime::FunctionForId(is_strict(function_language_mode())
-                                   ? Runtime::kDeleteProperty_Strict
-                                   : Runtime::kDeleteProperty_Sloppy),
-        2);
+    HValue* language_mode = Add<HConstant>(
+        static_cast<int32_t>(function_language_mode()), Representation::Smi());
+    Add<HPushArguments>(obj, key, language_mode);
+    HInstruction* instr =
+        New<HCallRuntime>(Runtime::FunctionForId(Runtime::kDeleteProperty), 3);
     return ast_context()->ReturnInstruction(instr, expr->id());
   } else if (proxy != NULL) {
     Variable* var = proxy->var();
     if (var->IsUnallocated()) {
       Bailout(kDeleteWithGlobalVariable);
     } else if (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.
       HValue* value = var->is_this() ? graph()->GetConstantTrue()
@@ skipping 2713 matching lines @@
     isolate()->GetHTracer()->TraceHydrogen(name(), graph_);
   }
 
 #ifdef DEBUG
   graph_->Verify(false);  // No full verify.
 #endif
 }
 
 }  // namespace internal
 }  // namespace v8