[vector] improve assertions of arrays of for the generated tests

[Paul Sandoz]

Hi

Please see this patch that modifies the assertions used by the generated tests. The prior approach could generate a lot of strings to GC for the assertion messages. There should be an observable speed up in the test execution.

I abstracted out the assertion mechanism so it accepts a function.

  http://cr.openjdk.java.net/~psandoz/panama/test-assertions/webrev/ <http://cr.openjdk.java.net/~psandoz/panama/test-assertions/webrev/>

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Separately we still need to consider using TestNG data providers which should reduce the explicit test of three masks down to one.

Thanks,
Paul.