Remove usages of alloca() according to style guide.

src/compiler/ast-graph-builder.cc

 // Copyright 2014 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/compiler/ast-graph-builder.h"
 
 #include "src/compiler.h"
 #include "src/compiler/control-builders.h"
 #include "src/compiler/machine-operator.h"
 #include "src/compiler/node-properties.h"
@@ skipping 1634 matching lines @@
   } else if (ast_context()->IsEffect()) {
     environment()->Pop();
   }
   compare_if.End();
   ast_context()->ReplaceValue();
 }
 
 
 Node* AstGraphBuilder::ProcessArguments(Operator* op, int arity) {
   DCHECK(environment()->stack_height() >= arity);
-  Node** all = info()->zone()->NewArray<Node*>(arity);  // XXX: alloca?
+  Node** all = info()->zone()->NewArray<Node*>(arity);
   for (int i = arity - 1; i >= 0; --i) {
     all[i] = environment()->Pop();
   }
   Node* value = NewNode(op, arity, all);
   return value;
 }
 
 
 Node* AstGraphBuilder::BuildLocalFunctionContext(Node* context, Node* closure) {
   int heap_slots = info()->num_heap_slots() - Context::MIN_CONTEXT_SLOTS;
@@ skipping 346 matching lines @@
     DCHECK(node->InputAt(frame_state_index)->op()->opcode() == IrOpcode::kDead);
 
     Node* frame_state_node = environment()->Checkpoint(ast_id, combine);
     node->ReplaceInput(frame_state_index, frame_state_node);
   }
 }
 
 }
 }
 }  // namespace v8::internal::compiler