RFR (trivial): JDK-8213469: Remove/fix leftovers from JDK-8213384: Move G1/C2 barrier verification into G1BarrierSetC2

[Roman Kennke]

In JDK-8213384 I moved G1 barrier verification to G1BarrierSetC2. I
forgot to remove unused includes. Also, might want to run G1
verification only before codegen as it was done before.

Bug:
https://bugs.openjdk.java.net/browse/JDK-8213469
Webrev:
http://cr.openjdk.java.net/~rkennke/JDK-8213469/webrev.00/

Passes: hotspot/jtreg:tier1

Ok?

Roman

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