Reland: [Compiler] Enable handles created during parsing and scope analysis to be deferred.

src/compilation-info.cc

Index: src/compilation-info.cc
diff --git a/src/compilation-info.cc b/src/compilation-info.cc
index f0930f395ec74489a3598e78497e8d44cc73d5d4..f9b51b569d9027309e74e24171c5e7c5ae60eecb 100644
--- a/src/compilation-info.cc
+++ b/src/compilation-info.cc
@@ -107,7 +107,6 @@ CompilationInfo::~CompilationInfo() {
     shared_info()->DisableOptimization(bailout_reason());
   }
   dependencies()->Rollback();
-  delete deferred_handles_;
 }
 
 int CompilationInfo::num_parameters() const {
@@ -131,8 +130,21 @@ bool CompilationInfo::ShouldSelfOptimize() {
          !shared_info()->optimization_disabled();
 }
 
+void CompilationInfo::set_deferred_handles(
+    std::shared_ptr<DeferredHandles> deferred_handles) {
+  DCHECK(deferred_handles_.get() == nullptr);
+  deferred_handles_.swap(deferred_handles);
+}
+
+void CompilationInfo::set_deferred_handles(DeferredHandles* deferred_handles) {
+  DCHECK(deferred_handles_.get() == nullptr);
+  deferred_handles_.reset(deferred_handles);
+}
+
 void CompilationInfo::ReopenHandlesInNewHandleScope() {
-  closure_ = Handle<JSFunction>(*closure_);
+  if (!closure_.is_null()) {
+    closure_ = Handle<JSFunction>(*closure_);
+  }
 }
 
 bool CompilationInfo::has_simple_parameters() {