Add a second kind of HandleScope that ties the lifetime of Handles created in its scope to the life…

src/compiler.h

Index: src/compiler.h
diff --git a/src/compiler.h b/src/compiler.h
index 26c0ac43c1b33d5ea25c942544cd3cbb882a0b86..291f659fe02809af3acaf7194ddb08da7e1a43f0 100644
--- a/src/compiler.h
+++ b/src/compiler.h
@@ -45,6 +45,8 @@ class CompilationInfo BASE_EMBEDDED {
   CompilationInfo(Handle<SharedFunctionInfo> shared_info, Zone* zone);
   CompilationInfo(Handle<JSFunction> closure, Zone* zone);
 
+  ~CompilationInfo();
+
   Isolate* isolate() {
     ASSERT(Isolate::Current() == isolate_);
     return isolate_;
@@ -173,6 +175,12 @@ class CompilationInfo BASE_EMBEDDED {
   // current compilation pipeline.
   void AbortOptimization();
 
+  void StorePersistentExtensions(
+      HandleScopeImplementer::PersistentExtensions* extensions) {
+    ASSERT(!persistent_extensions_);
+    persistent_extensions_ = extensions;
+  }
+
  private:
   Isolate* isolate_;
 
@@ -259,6 +267,8 @@ class CompilationInfo BASE_EMBEDDED {
   // CompilationInfo allocates.
   Zone* zone_;
 
+  HandleScopeImplementer::PersistentExtensions* persistent_extensions_;
+
   DISALLOW_COPY_AND_ASSIGN(CompilationInfo);
 };