[14] RFR (L): 8235756: C2: Merge AD instructions for DivV, SqrtV, FmaV, AddReductionV, and MulReductionV nodes

[Vladimir Ivanov]

http://cr.openjdk.java.net/~vlivanov/jbhateja/8235756/webrev.00/all/
https://bugs.openjdk.java.net/browse/JDK-8235756

Merge AD instructions for the following vector nodes:
   - DivVF/DivVD
   - SqrtVF/SqrtVD
   - FmaVF/FmaVD
   - AddReductionV*
   - MulReductionV*

Individual patches:
 
http://cr.openjdk.java.net/~vlivanov/jbhateja/8235756/webrev.00/individual

Testing: tier1-4, test run on different CPU flavors (KNL, SKL, etc)

Contributed-by: Jatin Bhateja <jatin.bhateja at intel.com>
Reviewed-by: vlivanov, sviswanathan, ?

Best regards,
Vladimir Ivanov