Add runtime options for large object space

Adds the two following options:
Option -XX:LargeObjectSpace={freelist, map, disabled}
Option -XX:LargeObjectThreshold=size specifies the size for which
primitive arrays are allocated in the large object space.

Added handling for large object space == null in collectors.

Fixed an error in the mem map space where we didn't use the page
aligned size LOS for bytes allocated, this resutled in heaps appearing
a bit smaller than they should be.

Change-Id: I6f17c3534b59e7dc68cd375153e7a846799b3da4
diff --git a/runtime/gc/space/large_object_space.h b/runtime/gc/space/large_object_space.h
index 9d5e090..a63c5c0 100644
--- a/runtime/gc/space/large_object_space.h
+++ b/runtime/gc/space/large_object_space.h
@@ -31,6 +31,12 @@
 
 class AllocationInfo;
 
+enum LargeObjectSpaceType {
+  kLargeObjectSpaceTypeDisabled,
+  kLargeObjectSpaceTypeMap,
+  kLargeObjectSpaceTypeFreeList,
+};
+
 // Abstraction implemented by all large object spaces.
 class LargeObjectSpace : public DiscontinuousSpace, public AllocSpace {
  public: