RFR(XS) 8224558: x86 Fix replicateB encoding

[Deshpande, Vivek R]

Hi All

The encoding for replicateB in x86.ad uses dst register as one of the source without initializing, when the source for the scalar value is memory.
This leads to wrong replication in the resulting vector.
I have a fix for the bug in this webrev:
http://cr.openjdk.java.net/~vdeshpande/8224558/webrev.00/
I have created following JBS Entry:
https://bugs.openjdk.java.net/browse/JDK-8224558

Kindly requesting review for the patch.

Regards,
Vivek
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