[vector] RFR: Gather/scatter cleanups

[Yang Zhang (Arm Technology China)]

>> Recently I also work on jmh build failures. I find here
>> http://hg.openjdk.java.net/panama/dev/file/0d924a4c4087/test/jdk/jdk/i
>> ncubator/vector/gen-template.sh#l101
>> perf_scalar_output is a local variable, but its name conflicts with global variable "perf_scalar_tests.template". How about adding "local" keyword to local variables to avoid name conflict?

> Agree.

> Let me know whether you prefer me to incorporate it into the patch or push it yourself separately.

Sorry. I missed this email in the weekend. I will create a patch for this.

Regards
Yang