Reland "Remove support for thread-based recompilation"

src/debug.cc

Index: src/debug.cc
diff --git a/src/debug.cc b/src/debug.cc
index dad5234887a315548494cacc6d0aef737731dde5..56756c47fbf7efcc373cbdf3f6a762de2ba50665 100644
--- a/src/debug.cc
+++ b/src/debug.cc
@@ -1842,7 +1842,7 @@ void Debug::PrepareForBreakPoints() {
   // functions as debugging does not work with optimized code.
   if (!has_break_points_) {
     if (isolate_->concurrent_recompilation_enabled()) {
-      isolate_->optimizing_compiler_thread()->Flush();
+      isolate_->optimizing_compile_dispatcher()->Flush();
     }
 
     Deoptimizer::DeoptimizeAll(isolate_);