RFR: 8262096: Vector API fails to work without C2

[Jie Fu]

Hi all,

Vector API won't work without C2.
The reason is that VectorSupport_GetMaxLaneCount [1] always returns -1 if C2 is not present.
But it should work even there is no JIT compiler since it's Java-level's api.
So let's fix it.

Thanks.
Best regards,
Jie

[1] https://github.com/openjdk/jdk/blob/master/src/hotspot/share/prims/vectorSupport.cpp#L364

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Commit messages:
 - 8262096: Vector API fails to work without C2

Changes: https://git.openjdk.java.net/jdk/pull/2667/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=2667&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8262096
  Stats: 3 lines in 1 file changed: 0 ins; 2 del; 1 mod
  Patch: https://git.openjdk.java.net/jdk/pull/2667.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/2667/head:pull/2667

PR: https://git.openjdk.java.net/jdk/pull/2667