[jdk21u-dev] RFR: 8291809: Convert compiler/c2/cr7200264/TestSSE2IntVect.java to IR verification test

[SendaoYan]

The option "-XX:LoopUnrollLimit=0" results in no unrolling and consequently no vectorization opportunities in the test code.

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Commit messages:
 - Backport 4da28b40f04acc355d86d44cb8d9fa0c5c7829bd

Changes: https://git.openjdk.org/jdk21u-dev/pull/235/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=235&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8291809
  Stats: 1184 lines in 4 files changed: 408 ins; 322 del; 454 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/235.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/235/head:pull/235

PR: https://git.openjdk.org/jdk21u-dev/pull/235