[runtime] Remove useless DELETE builtin.

src/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/hydrogen.h"
 
 #include <sstream>
 
 #include "src/v8.h"
 
@@ skipping 10392 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();
-    HValue* function = AddLoadJSBuiltin(Builtins::DELETE);
-    Add<HPushArguments>(obj, key, Add<HConstant>(function_language_mode()));
-    // TODO(olivf) InvokeFunction produces a check for the parameter count,
-    // even though we are certain to pass the correct number of arguments here.
-    HInstruction* instr = New<HInvokeFunction>(function, 3);
+    Add<HPushArguments>(obj, key);
+    HInstruction* instr = New<HCallRuntime>(
+        isolate()->factory()->empty_string(),
+        Runtime::FunctionForId(is_strict(function_language_mode())
+                                   ? Runtime::kDeleteProperty_Strict
+                                   : Runtime::kDeleteProperty_Sloppy),
+        2);
     return ast_context()->ReturnInstruction(instr, expr->id());
   } else if (proxy != NULL) {
     Variable* var = proxy->var();
     if (var->IsUnallocatedOrGlobalSlot()) {
       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->HasThisName(isolate()) ? graph()->GetConstantTrue()
@@ skipping 3007 matching lines @@
     isolate()->GetHTracer()->TraceHydrogen(name(), graph_);
   }
 
 #ifdef DEBUG
   graph_->Verify(false);  // No full verify.
 #endif
 }
 
 }  // namespace internal
 }  // namespace v8