Avoid UnwindException reports in load failures.

This prevents the real error from being obscured when e.g. a failure
occurs during setting loading.

Author: jnthn

src/vm/jvm/runtime/org/perl6/nqp/runtime/CompilationUnit.java

@@ -215,6 +215,9 @@ public void runLoadIfAvailable(ThreadContext tc) {
             try {
                 Ops.invokeArgless(tc, loadCodeRef);
             }
+            catch (ControlException e) {
+                throw e;
+            }
             catch (Exception e)
             {
                 throw ExceptionHandling.dieInternal(tc, e.toString());