[code-reflection] RFR: Exception regions fix [v8]

[Adam Sotona]

> BytecodeGenerator::computeExceptionRegionMembership now collects all necessary info into BitSets and directly declares the regions with CodeBuilder.
> All tests are now passing.
> 
> Please review.
> 
> Thanks,
> Adam

Adam Sotona has updated the pull request incrementally with one additional commit since the last revision:

  rollback of too ambitious BranchCompactor

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

Changes:
  - all: https://git.openjdk.org/babylon/pull/12/files
  - new: https://git.openjdk.org/babylon/pull/12/files/f40a53a1..38b5c19d

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=babylon&pr=12&range=07
 - incr: https://webrevs.openjdk.org/?repo=babylon&pr=12&range=06-07

  Stats: 218 lines in 2 files changed: 25 ins; 148 del; 45 mod
  Patch: https://git.openjdk.org/babylon/pull/12.diff
  Fetch: git fetch https://git.openjdk.org/babylon.git pull/12/head:pull/12

PR: https://git.openjdk.org/babylon/pull/12