RFR: 8302191: Performance degradation for float/double modulo on Linux [v12]

[Jan Kratochvil]

> I have OCA already processed/approved. I am not Author but my Author request is being processed these days (sent to Rob McKenna).
> I did regression test x86_64 OpenJDK-8. I will leave other regression testing on GHA.
> The patch (and former GCC performance regression) affects only x86_64+i686.

Jan Kratochvil 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 13 additional commits since the last revision:

 - Fix missing SharedRuntime::frem and SharedRuntime::drem on aarch64.
    - bugreported by sviswa7.
 - Merge branch 'master' into modulo
 - Fix #endif comment - found by dholmes-ora.
 - Merge branch 'master' into modulo
 - Fix win32 broken build.
 - Merge remote-tracking branch 'origin/master' into modulo
 - Always include the _WIN64 workaround - a review by dholmes-ora.
 - Remove comments to be moved to JBS (Bug System) - a review by jddarcy.
 - Uppercase L - a review by turbanoff.
 - Fix copyright author.
 - ... and 3 more: https://git.openjdk.org/jdk/compare/9f63957b...f03d4cdf

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/12508/files
  - new: https://git.openjdk.org/jdk/pull/12508/files/e4ff04dc..f03d4cdf

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=12508&range=11
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=12508&range=10-11

  Stats: 1676 lines in 129 files changed: 670 ins; 408 del; 598 mod
  Patch: https://git.openjdk.org/jdk/pull/12508.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/12508/head:pull/12508

PR: https://git.openjdk.org/jdk/pull/12508