[lworld] RFR: 8376825: [lworld] Remove duplicate asmtools from test/lib

[Dan Smith]

Removing obsolete test library.

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Commit messages:
 - Unnecessary @build step in TestDeoptimizationWhenBuffering
 - 8376825: [lworld] Remove duplicate asmtools from test/lib

Changes: https://git.openjdk.org/valhalla/pull/2003/files
  Webrev: https://webrevs.openjdk.org/?repo=valhalla&pr=2003&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8376825
  Stats: 26051 lines in 101 files changed: 0 ins; 26051 del; 0 mod
  Patch: https://git.openjdk.org/valhalla/pull/2003.diff
  Fetch: git fetch https://git.openjdk.org/valhalla.git pull/2003/head:pull/2003

PR: https://git.openjdk.org/valhalla/pull/2003