[code-reflection] RFR: Exception regions fix [v5]

[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:

  BranchCompactor improved to compact nested sequences of one conditional and one unconditional branch in a single pass.

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Changes:
  - all: https://git.openjdk.org/babylon/pull/12/files
  - new: https://git.openjdk.org/babylon/pull/12/files/779a658c..39287b69

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=babylon&pr=12&range=04
 - incr: https://webrevs.openjdk.org/?repo=babylon&pr=12&range=03-04

  Stats: 126 lines in 1 file changed: 114 ins; 0 del; 12 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