RFR: 8347472: Correct Attribute traversal and writing for Code attributes

[Chen Liang]

Make UnknownAttribute and CustomAttribute delivered in code traversal, and make sure stack maps update the label references after a code transform when it is reused. Other code-bound attributes are not updated as they cannot be supplied to a CodeBuilder.

Tested the 2 cases in the new AttributesInCodeTest fails on earlier JDKs.

Testing: JDK tier 1-3 ongoing

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Commit messages:
 - Fix exhaustive switch
 - Merge branch 'master' of https://github.com/openjdk/jdk into fix/code-traversal
 - 8347472: Correct Attribute traversal and writing for Code attributes

Changes: https://git.openjdk.org/jdk/pull/23521/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=23521&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8347472
  Stats: 218 lines in 10 files changed: 198 ins; 6 del; 14 mod
  Patch: https://git.openjdk.org/jdk/pull/23521.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/23521/head:pull/23521

PR: https://git.openjdk.org/jdk/pull/23521