Compilation warnings and a perf question

[Dmitry Vyazelenko]

Hi All,

I came across a couple of issues with jcstress:

- Warnings when generating and compiling code.
  * The annotation processor:
  ```
  warning: No processor claimed any of these annotations: org.openjdk.jcstress.annotations.Actor,org.openjdk.jcstress.annotations.Arbiter,org.openjdk.jcstress.annotations.Outcome,org.openjdk.jcstress.annotations.Outcome.Outcomes,org.openjdk.jcstress.annotations.State
  ```
  * Generated code:
  ```
  warning: [rawtypes] found raw type: CounterThread
        for (CounterThread t : threads) {
             ^
  missing type arguments for generic class CounterThread<R>
  where R is a type-variable:
    R extends Object declared in class CounterThread
  ```
  Both could be silenced with `-Xlint:-processing,-rawtypes`.

- Generation of the HTML report takes forever when a test has lots of unique outcomes and a wildcard matcher is used.
The following test takes 6 minutes to complete when the test is executed without special command line options.
```
import java.util.concurrent.atomic.AtomicLong;

@JCStressTest
@Outcome(id = ".*, true", expect = Expect.ACCEPTABLE, desc = "Boring")
@State
public class WildcardResultsTest
{
    private final AtomicLong counter = new AtomicLong(System.currentTimeMillis());

    @Actor
    public void actor1(JJZ_Result result)
    {
        result.r1 = counter.getAndIncrement();
    }

    @Actor
    public void actor2(JJZ_Result result)
    {
        result.r2 = counter.getAndIncrement();
    }

    @Arbiter
    public void arbiter(JJZ_Result result)
    {
        result.r3 = result.r1 != result.r2;
    }
}
```
It takes about 5 seconds for the harness to print the `HTML report generated at ...` line but the test does not terminate until six minutes later.
Attached is the CPU profile taken with an async-profiler. As can be seen from the profile 96% of time is taken by the `org.openjdk.jcstress.infra.grading.HTMLReportPrinter#emitTestReport` method.

Regards,
Dmitry

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