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 854b507c47339fd21a9d61eb58ed6ebf3e32f4b5..25407a746fc5a61b6e58e7e2fd1367427bb160f3 100644
--- a/src/debug.cc
+++ b/src/debug.cc
@@ -1843,7 +1843,7 @@ 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_);