[turbofan] reduce allocations outside of pipeline

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"
 #include "src/compiler/node-properties-inl.h"
 #include "src/full-codegen.h"
 #include "src/parser.h"
 #include "src/scopes.h"
 
 namespace v8 {
 namespace internal {
 namespace compiler {
 
 AstGraphBuilder::AstGraphBuilder(Zone* local_zone, CompilationInfo* info,
                                  JSGraph* jsgraph)
     : StructuredGraphBuilder(local_zone, jsgraph->graph(), jsgraph->common()),
       info_(info),
       jsgraph_(jsgraph),
-      globals_(0, info->zone()),
+      globals_(0, local_zone),
       breakable_(NULL),
       execution_context_(NULL) {
-  InitializeAstVisitor(info->zone());
+  InitializeAstVisitor(local_zone);
 }
 
 
 Node* AstGraphBuilder::GetFunctionClosure() {
   if (!function_closure_.is_set()) {
     // Parameter -1 is special for the function closure
     const Operator* op = common()->Parameter(-1);
     Node* node = NewNode(op, graph()->start());
     function_closure_.set(node);
   }
@@ skipping 2089 matching lines @@
     DCHECK(NodeProperties::GetFrameStateInput(node)->opcode() ==
            IrOpcode::kDead);
     NodeProperties::ReplaceFrameStateInput(
         node, environment()->Checkpoint(ast_id, combine));
   }
 }
 
 }
 }
 }  // namespace v8::internal::compiler