Less aggressive polling when concurrently compiling for OSR.

src/runtime.cc

Index: src/runtime.cc
diff --git a/src/runtime.cc b/src/runtime.cc
index 3787e0c77ca88afe9b6199993ffcb70424b87075..209c5b148b3336cfa5e32fdd2fe8cde8b32316e6 100644
--- a/src/runtime.cc
+++ b/src/runtime.cc
@@ -8608,7 +8608,7 @@ RUNTIME_FUNCTION(MaybeObject*, Runtime_CompileForOnStackReplacement) {
   Handle<Code> result = Handle<Code>::null();
   BailoutId ast_id = BailoutId::None();
 
-  if (FLAG_concurrent_recompilation && FLAG_concurrent_osr) {
+  if (FLAG_concurrent_osr) {
     if (isolate->optimizing_compiler_thread()->
             IsQueuedForOSR(function, pc_offset)) {
       // Still waiting for the optimizing compiler thread to finish.  Carry on.
@@ -8630,7 +8630,7 @@ RUNTIME_FUNCTION(MaybeObject*, Runtime_CompileForOnStackReplacement) {
             function->IsMarkedForConcurrentRecompilation()) {
           // Prevent regular recompilation if we queue this for OSR.
           // TODO(yangguo): remove this as soon as OSR becomes one-shot.
-          function->ReplaceCode(function->shared()->code());
+          function->ReplaceCode(*unoptimized);
         }
         return NULL;
       }