RFR: 8302191: Performance degradation for float/double modulo on Linux [v8]

[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 incrementally with one additional commit since the last revision:

  Always include the _WIN64 workaround - a review by dholmes-ora.

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Changes:
  - all: https://git.openjdk.org/jdk/pull/12508/files
  - new: https://git.openjdk.org/jdk/pull/12508/files/ef4cd57a..873562c8

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=12508&range=07
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=12508&range=06-07

  Stats: 71 lines in 2 files changed: 34 ins; 34 del; 3 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