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

src/compiler.cc

Index: src/compiler.cc
diff --git a/src/compiler.cc b/src/compiler.cc
index f706c7d03bedee9d4e4bb79033396a2f5aeb3615..1523ea2f87607d906248056aa825c5e54767c810 100644
--- a/src/compiler.cc
+++ b/src/compiler.cc
@@ -61,7 +61,8 @@ CompilationInfo::CompilationInfo(Handle<Script> script, Zone* zone)
       extension_(NULL),
       pre_parse_data_(NULL),
       osr_ast_id_(AstNode::kNoNumber),
-      zone_(zone) {
+      zone_(zone),
+      hidden_extensions_(NULL) {
   Initialize(BASE);
 }
 
@@ -79,7 +80,8 @@ CompilationInfo::CompilationInfo(Handle<SharedFunctionInfo> shared_info,
       extension_(NULL),
       pre_parse_data_(NULL),
       osr_ast_id_(AstNode::kNoNumber),
-      zone_(zone) {
+      zone_(zone),
+      hidden_extensions_(NULL) {
   Initialize(BASE);
 }
 
@@ -97,11 +99,20 @@ CompilationInfo::CompilationInfo(Handle<JSFunction> closure, Zone* zone)
       extension_(NULL),
       pre_parse_data_(NULL),
       osr_ast_id_(AstNode::kNoNumber),
-      zone_(zone) {
+      zone_(zone),
+      hidden_extensions_(NULL) {
   Initialize(BASE);
 }
 
 
+CompilationInfo::~CompilationInfo() {
+  if (hidden_extensions_) {
+    HandleScopeImplementer* impl = isolate_->handle_scope_implementer();
+    impl->DeleteHiddenExtensions(hidden_extensions_);
+  }
+}
+
+
 // Disable optimization for the rest of the compilation pipeline.
 void CompilationInfo::DisableOptimization() {
   bool is_optimizable_closure =