RFR: 8279900: compiler/vectorization/TestPopCountVectorLong.java fails due to vpopcntdq is not supported

[Jie Fu]

Hi all,

The test fails on our AVX512 machines due to `VM_Version::supports_avx512_vpopcntdq()` [1] is false.
So the test should not run if `vpopcntdq` is not supported.

Thanks.
Best regards,
Jie

[1] https://github.com/openjdk/jdk/blob/master/src/hotspot/cpu/x86/x86.ad#L1409

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Commit messages:
 - 8279900: compiler/vectorization/TestPopCountVectorLong.java fails due to vpopcntdq is not supported

Changes: https://git.openjdk.java.net/jdk/pull/7040/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=7040&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8279900
  Stats: 1 line in 1 file changed: 1 ins; 0 del; 0 mod
  Patch: https://git.openjdk.java.net/jdk/pull/7040.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/7040/head:pull/7040

PR: https://git.openjdk.java.net/jdk/pull/7040