RFR: 7904130: Update jtreg to bundle AsmTools 9.1

[Christian Stein]

Please review this change for jtreg to bundle AsmTools 9.1

The SHA1 checksum was computed and verified from the Source code `.zip` file attached to https://github.com/openjdk/asmtools/releases/tag/9.1-b01

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

Commit messages:
 - 7904130: Update jtreg to bundle AsmTools 9.1

Changes: https://git.openjdk.org/jtreg/pull/307/files
  Webrev: https://webrevs.openjdk.org/?repo=jtreg&pr=307&range=00
  Issue: https://bugs.openjdk.org/browse/CODETOOLS-7904130
  Stats: 4 lines in 2 files changed: 0 ins; 0 del; 4 mod
  Patch: https://git.openjdk.org/jtreg/pull/307.diff
  Fetch: git fetch https://git.openjdk.org/jtreg.git pull/307/head:pull/307

PR: https://git.openjdk.org/jtreg/pull/307