RFR: 8318913: The module-infos for --release data do not contain pre-set versions [v3]

[Jan Lahoda]

> Consider a simple module, like:
> 
> module test {}
> 
> 
> And compile it with JDK 22 and JDK 21 using:
> javac --release 21
> 
> The results of the compilations will differ: when compiling with JDK 21, the mandated java.base dependency will get a version, possibly like "21-internal". When compiling with JDK 22, the version of the java.base dependency will be empty.
> 
> This is a) because `module-info.class`es in `ct.sym` do not have any module version set; b) for JDK N, `--release N` is not using `ct.sym`, but rather `lib/modules`, which may contain a range of version specifiers.
> 
> This patch does two changes:
> a) tweaks the `module-info.class`es in `ct.sym`, so that they contain a simple version. For `--release N`, the version is `N`.
> b) tweaks the whole build so that `ct.sym` is used always for `--release`, a `lib/modules` is never used. I.e. the appropriate classfiles are copied into `ct.sym`. This not only allows for a general approach to module versions, but simplifies the `--release` handling in javac, and should enable future improvements. This is, however, a relatively big change.
> 
> The use of `lib/modules` for `--release <current>` was made to improve build performance, but the build has been updated since this has been introduced, so the slowdown caused by rebuilding `ct.sym` should be much lower now.
> 
> With these changes, compiling with `--release N` should record the same dependency versions in `module-info` on JDK N and JDK N + 1.

Jan Lahoda has updated the pull request incrementally with one additional commit since the last revision:

  Removing TransitiveDependencies, as suggested.

-------------

Changes:
  - all: https://git.openjdk.org/jdk/pull/16400/files
  - new: https://git.openjdk.org/jdk/pull/16400/files/f3be97d6..ac8fb43d

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=16400&range=02
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=16400&range=01-02

  Stats: 123 lines in 1 file changed: 0 ins; 123 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/16400.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/16400/head:pull/16400

PR: https://git.openjdk.org/jdk/pull/16400