Merge remote-tracking branch 'origin/jruby-9.4' into jruby-10.0

Author: headius

core/src/main/java/org/jruby/internal/runtime/RubyRunnable.java

@@ -111,6 +111,7 @@ public void run() {
         // uber-ThreadKill catcher, since it should always just mean "be dead"
         try {
             // Push a frame for the toplevel of the thread
+            context.pushFrame();
 
             // Call the thread's code
             Block threadBlock = proc.getBlock();