RFR: 8268575: Annotations not visible on model elements before they are generated

[Srikanth Adayapalam]

As an inadvertant side effect of JDK-8206325, the model was failing to expose a missing annotation type. Address this.

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Commit messages:
 - 8268575: Annotations not visible on model elements before they are generated

Changes: https://git.openjdk.java.net/jdk/pull/6662/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=6662&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8268575
  Stats: 114 lines in 3 files changed: 113 ins; 0 del; 1 mod
  Patch: https://git.openjdk.java.net/jdk/pull/6662.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/6662/head:pull/6662

PR: https://git.openjdk.java.net/jdk/pull/6662