RFR: 8328331: Rename files 'blockOffsetTable.[h|c]pp' to 'BOTConstants.[h|c]pp'

[Guoxiong Li]

Hi all,

This path renames the files `gc/shared/blockOffsetTable.[h|c]pp` to `BOTConstants.[h|c]pp`. Becuase these two files only have one class `BOTConstants`. Thanks for taking the time to review.

Best Regrads,
-- Guoxiong

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Commit messages:
 - Rename files.

Changes: https://git.openjdk.org/jdk/pull/18342/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=18342&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8328331
  Stats: 12 lines in 7 files changed: 0 ins; 0 del; 12 mod
  Patch: https://git.openjdk.org/jdk/pull/18342.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/18342/head:pull/18342

PR: https://git.openjdk.org/jdk/pull/18342