RFR: 8333131: Source launcher should work with service loader SPI [v2]

[Christian Stein]

> Please review this fix for the memory class loader to find classes defined by a modular source program; including classes referenced in its module descriptor.

Christian Stein has updated the pull request incrementally with one additional commit since the last revision:

  Add test

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Changes:
  - all: https://git.openjdk.org/jdk/pull/19443/files
  - new: https://git.openjdk.org/jdk/pull/19443/files/e85bc3df..c186cbb1

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=19443&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=19443&range=00-01

  Stats: 106 lines in 1 file changed: 106 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/19443.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/19443/head:pull/19443

PR: https://git.openjdk.org/jdk/pull/19443