RFR: 8371753: compiler/c2/cr7200264/TestIntVect.java fails IR verification

[Fei Yang]

Hi, please consider this test-only change fixing an IR test failure.

This test fails after https://bugs.openjdk.org/browse/JDK-8340093 which enabled IR matching for three vector nodes.
That relies on support for vector operations and will fail on platforms without that. This adds the necessary conditions
for applying this matching rule. This enables more IR matching in this test for RISC-V vector as well.

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Commit messages:
 - 8371753: compiler/c2/cr7200264/TestIntVect.java fails IR verification

Changes: https://git.openjdk.org/jdk/pull/28279/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=28279&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8371753
  Stats: 19 lines in 1 file changed: 1 ins; 0 del; 18 mod
  Patch: https://git.openjdk.org/jdk/pull/28279.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/28279/head:pull/28279

PR: https://git.openjdk.org/jdk/pull/28279