Fasta parser doesn't support annotations on local functions

[stereotype441]

The following syntax is accepted by analyzer, and AFAICT is permitted by the spec:

class Foo {
  const Foo();
}

void test() {
  @Foo()
  void f() {}
}

But it causes Fasta to give the following error:

pkg/front_end/testcases/inference/foo.dart:14:9: Error: Expected ';' before this.
  void f() {}
        ^