RFR: 8366017: Extend the set of inputs handled by fast paths in FloatingDecimal [v2]

[Raffaello Giulietti]

> Yet another step in modernizing `FloatingDecimal`s floating-point parsing.

Raffaello Giulietti has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains 31 commits:

 - Merge branch 'master' into 8366017
 - More complete benchmarks.
 - JMH benchmarks.
 - Adapted tests to more restricted access.
 - Merge branch 'master' into 8366017
 - Many simplifications.
 - Minors.
 - Various enhancements.
 - Simplified full precision.
 - Increase powers of 5 cache by 1.
 - ... and 21 more: https://git.openjdk.org/jdk/compare/b8d3c904...74536daf

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Changes: https://git.openjdk.org/jdk/pull/26990/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=26990&range=01
  Stats: 2933 lines in 7 files changed: 747 ins; 1427 del; 759 mod
  Patch: https://git.openjdk.org/jdk/pull/26990.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/26990/head:pull/26990

PR: https://git.openjdk.org/jdk/pull/26990