RFR: 8331908: Simplify log code in vectorintrinsics.cpp

[Hamlin Li]

Hi,
Can you help to review this simple patch?
Curretly, log code in vectorintrinsics.cpp is a bit redundant, could be simplified a bit.
Thanks.

## Test
sanity test, jdk/incubator/vector

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Commit messages:
 - Initial commit

Changes: https://git.openjdk.org/jdk/pull/19135/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=19135&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8331908
  Stats: 497 lines in 1 file changed: 14 ins; 322 del; 161 mod
  Patch: https://git.openjdk.org/jdk/pull/19135.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/19135/head:pull/19135

PR: https://git.openjdk.org/jdk/pull/19135