[jdk25u] RFR: 8361112: Use exact float -> Float16 conversion method in Float16 tests

[Abhishek N]

jdk-25.0.1/bin/java -jar jtreg7.5.2/jtreg/lib/jtreg.jar -testjdk:jdk-25.0.1 -verbose:summary -dir:jdk25u-cpu/open/test/jdk/ jdk/incubator/vector/BasicFloat16ArithTests.java
Passed: jdk/incubator/vector/BasicFloat16ArithTests.java
Test results: passed: 1
Report written to C:\jck\colocation\JTreport\html\report.html
Results written to C:\jck\colocation\JTwork

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Commit messages:
 - Backport 549b8758661e760a7475fb398fd5b036e561fed6

Changes: https://git.openjdk.org/jdk25u/pull/98/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk25u&pr=98&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8361112
  Stats: 37 lines in 1 file changed: 16 ins; 0 del; 21 mod
  Patch: https://git.openjdk.org/jdk25u/pull/98.diff
  Fetch: git fetch https://git.openjdk.org/jdk25u.git pull/98/head:pull/98

PR: https://git.openjdk.org/jdk25u/pull/98