[vectorIntrinsics+mask] RFR: 8273371: [Vector API] Crash in Assembler::evpermd when code-gen for masked rearrange operation on AVX512

[Jie Fu]

Hi all,

I'd like to fix the crash in Assembler::evpermd when code-gen for masked int/float rearrange operation on AVX512.
This is because evpermd can be only used for vector-size-in-bits > 128 [1].
The fix is disabling the code-gen for int/float if vector-size-in-bits < 256.

Thanks.
Best regards,
Jie

[1] https://www.felixcloutier.com/x86/vpermd:vpermw

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Commit messages:
 - 8273371: [Vector API] Crash in Assembler::evpermd when code-gen for masked rearrange operation on AVX512

Changes: https://git.openjdk.java.net/panama-vector/pull/121/files
 Webrev: https://webrevs.openjdk.java.net/?repo=panama-vector&pr=121&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8273371
  Stats: 2 lines in 1 file changed: 2 ins; 0 del; 0 mod
  Patch: https://git.openjdk.java.net/panama-vector/pull/121.diff
  Fetch: git fetch https://git.openjdk.java.net/panama-vector pull/121/head:pull/121

PR: https://git.openjdk.java.net/panama-vector/pull/121