RFR(S): 8175096: Use Subword Analysis for set vector size

[Deshpande, Vivek R]

Hi

Currently subword types cannot use entire vector width using SLP.
This fix analyzes the subword in the loop for possibility of narrowing and sets the vector size accordingly.

Webrev:
http://cr.openjdk.java.net/~vdeshpande/8175096/webrev.00/
I have also updated the JBS entry.
https://bugs.openjdk.java.net/browse/JDK-8175096
Would you please review and sponsor it.

Regards,
Vivek

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