RFR: 8336827: compiler/vectorization/TestFloat16VectorConvChain.java timeouts on ppc64 platforms after JDK-8335860 [v2]

[Matthias Baesken]

> After [JDK-8335860](https://bugs.openjdk.org/browse/JDK-8335860), we see a lot of timeouts in test compiler/vectorization/TestFloat16VectorConvChain.java
> on the ppc64 based platforms.
> The timeouts show up especially with the (fast)debug binaries.

Matthias Baesken has updated the pull request incrementally with one additional commit since the last revision:

  add requires part to the test, taken from compiler/intrinsics/float16/TestAllFloat16ToFloat.java

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Changes:
  - all: https://git.openjdk.org/jdk/pull/20276/files
  - new: https://git.openjdk.org/jdk/pull/20276/files/2c149b77..8f41964e

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=20276&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=20276&range=00-01

  Stats: 3 lines in 1 file changed: 2 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/20276.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/20276/head:pull/20276

PR: https://git.openjdk.org/jdk/pull/20276