[GR-32011] Enable stacktrace for KillException to help debugging

PullRequest: truffleruby/2719

Author: eregon

src/main/java/org/truffleruby/core/VMPrimitiveNodes.java

@@ -119,6 +119,7 @@ protected Object doCatch(Object tag, RubyProc block,
     @Primitive(name = "vm_exit", lowerFixnum = 0)
     public abstract static class VMExitNode extends PrimitiveArrayArgumentsNode {
 
+        @TruffleBoundary
         @Specialization
         protected Object vmExit(int status) {
             throw new ExitException(status);

src/main/java/org/truffleruby/language/control/TerminationException.java

@@ -9,9 +9,7 @@
  */
 package org.truffleruby.language.control;
 
-import com.oracle.truffle.api.nodes.ControlFlowException;
-
-public class TerminationException extends ControlFlowException {
+public class TerminationException extends RuntimeException {
 
     private static final long serialVersionUID = 2170201891607264355L;