[lworld+fp16] Integrated: 8341005: [lworld+fp16] Disable intrinsification of Float16.abs and Float16.negate for x86 target

[Jatin Bhateja]

- Java side implementation is efficient and auto-vectorizable.
- Unlike AARCH64 SVE, x86 FP16 ISA does not support direct negation instruction.

No performance impact seen in benchmarks.

Best Regard,
Jatin

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Commit messages:
 - 8341005: [lworld+fp16] Revert intrinsification of Float16.abs and Float16.negate for x86 target

Changes: https://git.openjdk.org/valhalla/pull/1255/files
  Webrev: https://webrevs.openjdk.org/?repo=valhalla&pr=1255&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8341005
  Stats: 62 lines in 2 files changed: 0 ins; 60 del; 2 mod
  Patch: https://git.openjdk.org/valhalla/pull/1255.diff
  Fetch: git fetch https://git.openjdk.org/valhalla.git pull/1255/head:pull/1255

PR: https://git.openjdk.org/valhalla/pull/1255