[vector] Miscellaneous tests to complete coverage of X-VectorBits.java plus fix

[Viswanathan, Sandhya]

Please find below a webrev which adds miscellaneous tests and attempts to increase the coverage of X-VectorBits.java to 100%:

http://cr.openjdk.java.net/~sviswanathan/vectorIntrinsics/TestCoverage/part5/webrev.00/

The webrev also fixes an issue found in masked rearrange.

The smoke tests added are:

  1.  Masked rearrange
  2.  selectFrom masked/unmasked
  3.  reduceLanesToLong masked/unmasked
  4.  elementSize
  5.  shape

Best Regards,
Sandhya