RFR: Separate ASM-dependent code into a separate source tree.

Tue Jan 3 19:26:50 UTC 2023

Separate ASM-dependent code into a separate source tree.
Introduce modules.
Changes in test infrastructure and more tests pending.
Build is so far kept compatible with the previous version, only adding creation of two jmods.

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Commit messages:
 - Saparate ASM into a separate source tree.

Changes: https://git.openjdk.org/jcov/pull/35/files
 Webrev: https://webrevs.openjdk.org/?repo=jcov&pr=35&range=00
  Stats: 1169 lines in 57 files changed: 550 ins; 580 del; 39 mod
  Patch: https://git.openjdk.org/jcov/pull/35.diff
  Fetch: git fetch https://git.openjdk.org/jcov pull/35/head:pull/35

PR: https://git.openjdk.org/jcov/pull/35