RFR: 8366017: Extend the set of inputs handled by fast paths in FloatingDecimal [v5]

[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 34 commits:

 - Merge branch 'master' into 8366017
 - Added tests to exercise fast paths.
 - Fix a rare bug.
 - Merge branch 'master' into 8366017
 - More complete benchmarks.
 - JMH benchmarks.
 - Adapted tests to more restricted access.
 - Merge branch 'master' into 8366017
 - Many simplifications.
 - Minors.
 - ... and 24 more: https://git.openjdk.org/jdk/compare/470eedb1...314c984f

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Changes: https://git.openjdk.org/jdk/pull/26990/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=26990&range=04
  Stats: 2983 lines in 8 files changed: 795 ins; 1395 del; 793 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