ll_prof: Reduce profiling hooks overhead from >400% to 25%.

src/isolate.cc

Index: src/isolate.cc
diff --git a/src/isolate.cc b/src/isolate.cc
index 298d2e6547df21f2adf450a2975ee7fd0a4c9356..6fc671c50c404d66b11c7bfe92eed7883ac698e9 100644
--- a/src/isolate.cc
+++ b/src/isolate.cc
@@ -818,7 +818,7 @@ bool Isolate::Init(Deserializer* des) {
 
   // If we are deserializing, log non-function code objects and compiled
   // functions found in the snapshot.
-  if (des != NULL && FLAG_log_code) {
+  if (des != NULL && (FLAG_log_code || FLAG_ll_prof)) {
     HandleScope scope;
     LOG(this, LogCodeObjects());
     LOG(this, LogCompiledFunctions());