javac8 annotation processors don't visit parameter annotations

[Liam Miller-Cushon]

There appears to be a javac8 bug that prevents annotation processors from
visiting annotations on parameters. When repeated annotations were
implemented [1][2] the annotation scanners in JavacProcessingEnvironment
and JavacRoundEnvironment were modified and the following override was
added:

@Override
public Set<TypeElement> visitExecutable(ExecutableElement e,
Set<TypeElement> p) {
  // Type parameters are not considered to be enclosed by an executable
  scan(e.getTypeParameters(), p);
  return scan(e.getEnclosedElements(), p);
}

MethodSymbols don't have any enclosed elements, but they do have parameters
(which currently aren't being visited). I think that line was meant to
match the base implementation in ElementScanner:

return scan(e.getParameters(), p);


[1] https://bugs.openjdk.java.net/browse/JDK-7162089
[2] http://hg.openjdk.java.net/jdk8/jdk8/langtools/rev/1908e86ee49a
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