Declaration annotations in type-annotation-only positions

[Werner Dietl]

Dear type annotation developers,

I have some changes in the type-annotations repository that should be
propagated to TL.
It's three changesets that should be merged into one:

http://hg.openjdk.java.net/type-annotations/type-annotations/langtools/rev/098327afad8d
http://hg.openjdk.java.net/type-annotations/type-annotations/langtools/rev/9cb6d18db886
http://hg.openjdk.java.net/type-annotations/type-annotations/langtools/rev/2da59ead687f

These changes prevent a NullPointerException in a simple test case and
then refactor how the checks are implemented.

All comments welcome!
cu, WMD.

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