RFR: JDK-8225171: Remove leftovers in shenandoahBarrierSetC1.cpp

[Roman Kennke]

 In shenandoahBarrierSetC1.cpp, we have a few leftover #define
PATCHED_ADDR, from pre-LRB.

Bug:
https://bugs.openjdk.java.net/browse/JDK-8225171
Webrev:
http://cr.openjdk.java.net/~rkennke/JDK-8225171/webrev.00/

Testing: hotspot_gc_shenandoah

Ok?

Roman

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