RFR: 8308966 Add intrinsic for float/double modulo for x86 AVX2 and AVX512 [v8]

[Scott Gibbons]

> Add an intrinsic for x86 AVX and AVX512 fmod.  This addresses both a performance regression and acceleration of the floating point remainder operation (fmod / frem).  Also addresses dmod / drem.
> 
> Performance has increased an average of ~4x as indicated by the benchmark included with [JDK-8302191](https://bugs.openjdk.org/browse/JDK-8302191).
> 
> Old:
> gcc-12.2.1-4.fc36.x86_64
> 3db352d003c5996a5f86f0f465adf86326f7e1fe openjdk21 + fix
> JVM version: 21-internal
> Iteration 0 regression case Took : 89 noMod case took: 39 noPower case took: 68
> Iteration 1 regression case Took : 86 noMod case took: 39 noPower case took: 67
> Iteration 2 regression case Took : 41 noMod case took: 39 noPower case took: 70
> Iteration 3 regression case Took : 41 noMod case took: 39 noPower case took: 69
> Iteration 4 regression case Took : 40 noMod case took: 39 noPower case took: 44
> Iteration 5 regression case Took : 47 noMod case took: 39 noPower case took: 40
> Iteration 6 regression case Took : 41 noMod case took: 39 noPower case took: 40
> Iteration 7 regression case Took : 40 noMod case took: 39 noPower case took: 40
> Iteration 8 regression case Took : 41 noMod case took: 38 noPower case took: 41
> Iteration 9 regression case Took : 40 noMod case took: 39 noPower case took: 40
> New:
> JVM version: 21-internal  (float)
> Iteration 0 regression case Took : 24 noMod case took: 11 noPower case took: 42
> Iteration 1 regression case Took : 35 noMod case took: 22 noPower case took: 27
> Iteration 2 regression case Took : 17 noMod case took: 19 noPower case took: 17
> Iteration 3 regression case Took : 17 noMod case took: 3 noPower case took: 16
> Iteration 4 regression case Took : 17 noMod case took: 3 noPower case took: 17
> Iteration 5 regression case Took : 16 noMod case took: 3 noPower case took: 17
> Iteration 6 regression case Took : 16 noMod case took: 3 noPower case took: 17
> Iteration 7 regression case Took : 17 noMod case took: 3 noPower case took: 16
> Iteration 8 regression case Took : 17 noMod case took: 3 noPower case took: 16
> Iteration 9 regression case Took : 17 noMod case took: 3 noPower case took: 17

Scott Gibbons has updated the pull request incrementally with one additional commit since the last revision:

  Finish review comments; add tests for corner cases

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/14224/files
  - new: https://git.openjdk.org/jdk/pull/14224/files/1b44cd62..624d1248

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=14224&range=07
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=14224&range=06-07

  Stats: 238 lines in 4 files changed: 236 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jdk/pull/14224.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/14224/head:pull/14224

PR: https://git.openjdk.org/jdk/pull/14224