Do not catch 'ExitException' and 'ThreadDeath'.

com.oracle.truffle.r.runtime/src/com/oracle/truffle/r/runtime/RInternalError.java

@@ -217,6 +217,8 @@ public final class RInternalError extends Error implements TruffleException {
                     System.err.println(message);
                 }
             }
+        } catch (ExitException | ThreadDeath t) {
+            throw t;
         } catch (Throwable t) {
             System.err.println("error while reporting internal error:");
             t.printStackTrace();