Revert of Reland "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 12a1385ebfa3a8e81953d91c334f1466650a0518..418cad72be73f8598690cc42e56edc7368d405e2 100644
--- a/src/heap/heap.cc
+++ b/src/heap/heap.cc
@@ -429,7 +429,7 @@
   store_buffer()->GCPrologue();
 
   if (isolate()->concurrent_osr_enabled()) {
-    isolate()->optimizing_compile_dispatcher()->AgeBufferedOsrJobs();
+    isolate()->optimizing_compiler_thread()->AgeBufferedOsrJobs();
   }
 
   if (new_space_.IsAtMaximumCapacity()) {
@@ -766,7 +766,7 @@
   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 |
@@ -884,7 +884,7 @@
   }
   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()));