Revert of Remove support for thread-based recompilation

src/heap/heap.cc

Index: src/heap/heap.cc
diff --git a/src/heap/heap.cc b/src/heap/heap.cc
index 22eea2dcad75f40fe5af4d5717d55614ebd0ece3..1fe546386ba8d8baa5c452f87a218a19a2111781 100644
--- a/src/heap/heap.cc
+++ b/src/heap/heap.cc
@@ -441,7 +441,7 @@ void Heap::GarbageCollectionPrologue() {
   store_buffer()->GCPrologue();
 
   if (isolate()->concurrent_osr_enabled()) {
-    isolate()->optimizing_compile_dispatcher()->AgeBufferedOsrJobs();
+    isolate()->optimizing_compiler_thread()->AgeBufferedOsrJobs();
   }
 
   if (new_space_.IsAtMaximumCapacity()) {
@@ -784,7 +784,7 @@ void Heap::CollectAllAvailableGarbage(const char* gc_reason) {
   if (isolate()->concurrent_recompilation_enabled()) {
     // The optimizing compiler may be unnecessarily holding on to memory.
     DisallowHeapAllocation no_recursive_gc;
-    isolate()->optimizing_compile_dispatcher()->Flush();
+    isolate()->optimizing_compiler_thread()->Flush();
   }
   isolate()->ClearSerializerData();
   mark_compact_collector()->SetFlags(kMakeHeapIterableMask |
@@ -902,7 +902,7 @@ int Heap::NotifyContextDisposed(bool dependant_context) {
   }
   if (isolate()->concurrent_recompilation_enabled()) {
     // Flush the queued recompilation tasks.
-    isolate()->optimizing_compile_dispatcher()->Flush();
+    isolate()->optimizing_compiler_thread()->Flush();
   }
   AgeInlineCaches();
   set_retained_maps(ArrayList::cast(empty_fixed_array()));