check style fix; RPerfStats option fix

com.oracle.truffle.r.nodes/src/com/oracle/truffle/r/nodes/instrumentation/RFunctionProfiler.java

@@ -131,7 +131,7 @@ public class RFunctionProfiler {
     }
 
     private static class PerfHandler implements RPerfStats.Handler {
-        static final String NAME = "timer";
+        static final String NAME = "timing";
         @SuppressWarnings("unused") private boolean stmts;
         private int threshold;
 

com.oracle.truffle.r.runtime/src/com/oracle/truffle/r/runtime/instrument/InstrumentationState.java

@@ -38,7 +38,7 @@ import com.oracle.truffle.tools.Profiler;
  * specific.
  *
  */
-public class InstrumentationState implements RContext.ContextState {
+public final class InstrumentationState implements RContext.ContextState {
 
     /**
      * Records all functions that have trace listeners installed.