RFR: 7902697: Switch jcov to the latest asm lib to support latest classfile

[Leonid Kuskov]

This is the fix for the issue https://bugs.openjdk.java.net/browse/CODETOOLS-7902697

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Commit messages:
 - 7902697: Switch jcov to the latest asm lib to support latest classfile

Changes: https://git.openjdk.java.net/jcov/pull/2/files
 Webrev: https://webrevs.openjdk.java.net/jcov/2/webrev.00
  Issue: https://bugs.openjdk.java.net/browse/CODETOOLS-7902697
  Stats: 43 lines in 4 files changed: 24 ins; 0 del; 19 mod
  Patch: https://git.openjdk.java.net/jcov/pull/2.diff
  Fetch: git fetch https://git.openjdk.java.net/jcov pull/2/head:pull/2

PR: https://git.openjdk.java.net/jcov/pull/2