RFR: 8262096: Vector API fails to work without C2 [v2]

[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

Jie Fu has updated the pull request incrementally with one additional commit since the last revision:

  Fix zero and minimal build failure

-------------

Changes:
  - all: https://git.openjdk.java.net/jdk/pull/2667/files
  - new: https://git.openjdk.java.net/jdk/pull/2667/files/0e0e03ab..059aa729

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=2667&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=2667&range=00-01

  Stats: 1 line in 1 file changed: 0 ins; 0 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