Fix dumpsys meminfo <pid>.

Added a case for BumpPointerSpaces. Confirmed working non-debug.
Should also work in debug builds.

Bug: 11830794
Change-Id: I12053ff16eec403dcd4a780e13095e3212a77132
diff --git a/runtime/mirror/array-inl.h b/runtime/mirror/array-inl.h
index 46ffaae..a754b69 100644
--- a/runtime/mirror/array-inl.h
+++ b/runtime/mirror/array-inl.h
@@ -58,6 +58,7 @@
   return size;
 }
 
+// Used for setting the array length in the allocation code path to ensure it is guarded by a CAS.
 class SetLengthVisitor {
  public:
   explicit SetLengthVisitor(int32_t length) : length_(length) {