RFR: JDK-8307331: Correctly update line maps when class redefine rewrites bytecodes

[Andrew Dinn]

This small change ensures that repeated bytecode rewrites necessitated by class pool index updates are applied cumulatively when updating the method line number table. The current code applies each change to the original table which means only the last one is applied (and even then with the wrong adjustment).

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Commit messages:
 - JDK-8307331: Correctly update line maps when class redefine rewrites bytecodes

Changes: https://git.openjdk.org/jdk/pull/13795/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=13795&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8307331
  Stats: 18 lines in 1 file changed: 17 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/13795.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/13795/head:pull/13795

PR: https://git.openjdk.org/jdk/pull/13795