[jdk17u-dev] RFR: 8275643: C2's unaryOp vector intrinsic does not properly handle LongVector.neg

[Goetz Lindenmaier]

I backport this for parity with 17.0.3-oracle.
Requires follow-up test fix.

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Commit messages:
 - Backport 47564caeb0628e5c03a0e7f04093adce77d6dd3b

Changes: https://git.openjdk.java.net/jdk17u-dev/pull/139/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk17u-dev&pr=139&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8275643
  Stats: 51 lines in 2 files changed: 51 ins; 0 del; 0 mod
  Patch: https://git.openjdk.java.net/jdk17u-dev/pull/139.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk17u-dev pull/139/head:pull/139

PR: https://git.openjdk.java.net/jdk17u-dev/pull/139