RFR: 8265591: Remove vestiages of intermediate JSR 175 annotation format

[Joe Darcy]

During the recent review of JDK-8228988, I noticed again the comments in the annotation parser about support for the pre-GA annotation format used before JDK 5.0 shipped. During the development of annotations, there was a late change to correct a flaw in the annotation encoding, JDK-5020908.

I don't think it is necessary to carry forward support for this transient format any longer and this changeset removes support from both core reflection and javac.

Clean runs of relevant test; I gauge this fix as no-reg hard.

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Commit messages:
 - 8265591: Remove vestiages of intermediate JSR 175 annotation format

Changes: https://git.openjdk.java.net/jdk/pull/3597/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=3597&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8265591
  Stats: 24 lines in 2 files changed: 0 ins; 19 del; 5 mod
  Patch: https://git.openjdk.java.net/jdk/pull/3597.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/3597/head:pull/3597

PR: https://git.openjdk.java.net/jdk/pull/3597