RFR: JDK-8206272: Remove stray BarrierSetAssembler call

[Roman Kennke]

 and while we are at trivial fixes, we've a call to get a
BarrierSetAssembler* in methodHandles_x86.cpp that is subsequently not
used anywhere.

Bug:
https://bugs.openjdk.java.net/browse/JDK-8206272
Webrev:
http://cr.openjdk.java.net/~rkennke/JDK-8206272/webrev.00/

I assume this qualifies as trivial?

Roman

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