RFR: 8345319: Fix the tag type in PoolEntry and AnnotationValue

[Chen Liang]

Change the return type of PoolEntry and AnnotationValue tags to int, as in TypeAnnotation TargetType and StackMapFrameInfo frameType.  The main impact is that AnnotationValue tags should be converted to char before printing now.

Please review the associated CSR for this hotfix as well.

Testing: classfile and javap, tier 1-3 in progress

Pinging @lukellmann

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Commit messages:
 - 8345319: Fix the tag type in PoolEntry and AnnotationValue

Changes: https://git.openjdk.org/jdk/pull/22489/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=22489&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8345319
  Stats: 44 lines in 6 files changed: 3 ins; 0 del; 41 mod
  Patch: https://git.openjdk.org/jdk/pull/22489.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/22489/head:pull/22489

PR: https://git.openjdk.org/jdk/pull/22489