RFR: 8347471: Provide valid flags and mask in AccessFlag.Location [v5]

[Chen Liang]

> Some AccessFlag parsing methods throw IAE because a flag mask is not valid in a location. However, there is no easy way to check what flag mask bits or what flags are valid for a location. We need such APIs to check, specific to each class file format version.
> 
> Also in the investigation, it's noted that `ACC_SYNTHETIC` is incorrectly represented - it is available since release 5.0 instead of release 7. This bug is fixed together for implementation simplicity.
> 
> The new methods are all in `AccessFlag.Location`:
> - `Set<AccessFlag> flags()`
> - `int flagsMask()`
> - `Set<AccessFlag> flags(ClassFileFormatVersion)`
> - `int flagsMask(ClassFileFormatVersion)`
> 
> Also there is some simplification to `AccessFlag` itself to remove the anonymous classes, which should be more startup-friendly.
> 
> Testing: Tier 1-3

Chen Liang has updated the pull request incrementally with one additional commit since the last revision:

  Preview notes

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Changes:
  - all: https://git.openjdk.org/jdk/pull/23095/files
  - new: https://git.openjdk.org/jdk/pull/23095/files/303edd90..7e6d58a1

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=23095&range=04
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=23095&range=03-04

  Stats: 44 lines in 1 file changed: 36 ins; 1 del; 7 mod
  Patch: https://git.openjdk.org/jdk/pull/23095.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/23095/head:pull/23095

PR: https://git.openjdk.org/jdk/pull/23095