RFR: 8341470: BigDecimal.stripTrailingZeros() optimization [v31]

[fabioromano1]

> An optimized algorithm for `BigDecimal.stripTrailingZeros()` that uses repeated squares trick.

fabioromano1 has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains 36 additional commits since the last revision:

 - Merge branch 'openjdk:master' into patchStripTrailingZeros
 - Correct typo in comment
 - Speed up computation of shiftRight() and bitLength()
 - Minor change
 - More explaining variable identificator
 - Correct indentation
 - Refine the estimate of remaining zeros
 - Minor change
 - Optimization
 - An optimization
 - ... and 26 more: https://git.openjdk.org/jdk/compare/8530cce3...8b90da08

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/21323/files
  - new: https://git.openjdk.org/jdk/pull/21323/files/4c880789..8b90da08

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=21323&range=30
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=21323&range=29-30

  Stats: 11821 lines in 232 files changed: 9817 ins; 1317 del; 687 mod
  Patch: https://git.openjdk.org/jdk/pull/21323.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/21323/head:pull/21323

PR: https://git.openjdk.org/jdk/pull/21323