RFR: 7903955: jtreg doesn't support .jasm in patch module [v3]

[Christian Stein]

> Please review this change to support compilation of `.jasm` in patched modules.
> 
> Prior to this commit an extra check for `module != null` was the only difference when treating `.java` source files and JASM-related files. With that check removed, the handling of both types of source files could be merged.

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

  Always run ModLibsTest targets

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

Changes:
  - all: https://git.openjdk.org/jtreg/pull/249/files
  - new: https://git.openjdk.org/jtreg/pull/249/files/a97f575c..6b52ff56

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jtreg&pr=249&range=02
 - incr: https://webrevs.openjdk.org/?repo=jtreg&pr=249&range=01-02

  Stats: 3 lines in 1 file changed: 0 ins; 3 del; 0 mod
  Patch: https://git.openjdk.org/jtreg/pull/249.diff
  Fetch: git fetch https://git.openjdk.org/jtreg.git pull/249/head:pull/249

PR: https://git.openjdk.org/jtreg/pull/249