RFR: 8314544: Matrix multiple benchmark using Vector API [v2]

[Martin Stypinski]

> Added a bunch of different implementations for Vector API Matrix Multiplications:
> 
> - Baseline
> - Blocked (Cache Local)
> - FMA
> - Vector API Simple Implementation
> - Vector API Blocked Implementation
> 
> Commit was discussed with @PaulSandoz

Martin Stypinski has updated the pull request incrementally with two additional commits since the last revision:

 - changed for consistency
 - improved some RandomGenerator & unuseed Imports

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/15338/files
  - new: https://git.openjdk.org/jdk/pull/15338/files/c5289fdc..5bda0c2e

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=15338&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=15338&range=00-01

  Stats: 6 lines in 1 file changed: 1 ins; 1 del; 4 mod
  Patch: https://git.openjdk.org/jdk/pull/15338.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/15338/head:pull/15338

PR: https://git.openjdk.org/jdk/pull/15338