src: use PersistentToLocal() in a few more places

Update a few more `Local<T>::New(isolate, persistent)` call sites to
`PersistentToLocal(isolate, persistent)` - the latter has a fast path
for non-weak persistent references.

src/handle_wrap.h

@@ -69,7 +69,7 @@ class HandleWrap {
   virtual ~HandleWrap();
 
   inline v8::Local<v8::Object> object() {
-    return v8::Local<v8::Object>::New(node_isolate, persistent());
+    return PersistentToLocal(node_isolate, persistent());
   }
 
   inline v8::Persistent<v8::Object>& persistent() {

src/node_crypto.cc

@@ -3315,6 +3315,9 @@ void EIO_PBKDF2After(uv_work_t* work_req, int status) {
   assert(status == 0);
   pbkdf2_req* req = container_of(work_req, pbkdf2_req, work_req);
   HandleScope scope(node_isolate);
+  // Create a new Local that's associated with the current HandleScope.
+  // PersistentToLocal() returns a handle that gets zeroed when we call
+  // Dispose() so don't use that.
   Local<Object> obj = Local<Object>::New(node_isolate, req->obj);
   req->obj.Dispose();
   Local<Value> argv[2];

src/node_script.cc

@@ -174,7 +174,7 @@ Local<Object> WrappedContext::NewInstance() {
 
 
 Local<Context> WrappedContext::GetV8Context() {
-  return Local<Context>::New(node_isolate, context_);
+  return PersistentToLocal(node_isolate, context_);
 }
 
 
@@ -404,7 +404,7 @@ void WrappedScript::EvalMachine(const FunctionCallbackInfo<Value>& args) {
           "'this' must be a result of previous new Script(code) call.");
     }
 
-    script = Local<Script>::New(node_isolate, n_script->script_);
+    script = PersistentToLocal(node_isolate, n_script->script_);
   }
 
   if (output_flag == returnResult) {

src/req_wrap.h

@@ -22,6 +22,7 @@
 #ifndef SRC_REQ_WRAP_H_
 #define SRC_REQ_WRAP_H_
 
+#include "node.h"
 #include "queue.h"
 
 namespace node {
@@ -69,7 +70,7 @@ class ReqWrap {
   }
 
   inline v8::Local<v8::Object> object() {
-    return v8::Local<v8::Object>::New(node_isolate, persistent());
+    return PersistentToLocal(node_isolate, persistent());
   }
 
   inline v8::Persistent<v8::Object>& persistent() {

src/tls_wrap.h

@@ -22,9 +22,10 @@
 #ifndef SRC_TLS_WRAP_H_
 #define SRC_TLS_WRAP_H_
 
-#include "v8.h"
-#include "stream_wrap.h"
+#include "node.h"
 #include "queue.h"
+#include "stream_wrap.h"
+#include "v8.h"
 
 #include <openssl/ssl.h>
 
@@ -162,7 +163,7 @@ class TLSCallbacks : public StreamWrapCallbacks {
 #endif  // SSL_CTRL_SET_TLSEXT_SERVERNAME_CB
 
   inline v8::Local<v8::Object> object() {
-    return v8::Local<v8::Object>::New(node_isolate, persistent());
+    return PersistentToLocal(node_isolate, persistent());
   }
 
   inline v8::Persistent<v8::Object>& persistent() {