RFR: 8373428: Refine variables with the same name in nested scopes in PhaseChaitin::gather_lrg_masks

[Hamlin Li]

Hi,
Can you help to review this trivial patch?

In PhaseChaitin::gather_lrg_masks, several variables have the same name in nested scopes, it looks like following code snippet.
{
  A a;
  {
    A a;
  }
}

This is not helpful to code readability, in particular in a long method like `gather_lrg_masks`, better to rename them.

Thanks!

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Commit messages:
 - more
 - initial commit

Changes: https://git.openjdk.org/jdk/pull/28748/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=28748&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8373428
  Stats: 20 lines in 1 file changed: 0 ins; 0 del; 20 mod
  Patch: https://git.openjdk.org/jdk/pull/28748.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/28748/head:pull/28748

PR: https://git.openjdk.org/jdk/pull/28748