RFR: Fix build

[Roman Kennke]

The following patch is needed to fix the build (tried slowdebug on
aarch64 on RHEL 7.4):

diff -r 90a2a29e9e0c src/share/vm/gc/g1/g1CollectedHeap.inline.hpp
--- a/src/share/vm/gc/g1/g1CollectedHeap.inline.hpp     Thu Sep 07
12:01:54 2017 +0200
+++ b/src/share/vm/gc/g1/g1CollectedHeap.inline.hpp     Thu Sep 07
15:31:39 2017 -0400
@@ -303,7 +303,7 @@
     return false;
   }

-  assert(oopDesc::is_oop(entry, true /* ignore mark word */),
+  assert(oopDesc::is_oop(oop(entry), true /* ignore mark word */),
          "Invalid oop in SATB buffer: " PTR_FORMAT, p2i(entry));

   return ! isMarkedNext((oop) entry);
diff -r 90a2a29e9e0c src/share/vm/gc/shenandoah/shenandoahHeapRegion.cpp
--- a/src/share/vm/gc/shenandoah/shenandoahHeapRegion.cpp       Thu Sep
07 12:01:54 2017 +0200
+++ b/src/share/vm/gc/shenandoah/shenandoahHeapRegion.cpp       Thu Sep
07 15:31:39 2017 -0400
@@ -484,7 +484,7 @@
       last = cur;
       cur += oop(cur)->size() + BrooksPointer::word_size();
     }
-    assert(oopDesc::is_oop(last),
+    assert(oopDesc::is_oop(oop(last)),
            PTR_FORMAT" should be an object start", p2i(last));
     return last;
   }


Ok to push?