Fix missing initialization of mark-compact flags.

R=svenpanne@chromium.org

Review URL: https://chromiumcodereview.appspot.com/9662056

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@11006 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/mark-compact.cc

@@ -60,6 +60,8 @@ MarkCompactCollector::MarkCompactCollector() :  // NOLINT
       state_(IDLE),
 #endif
       sweep_precisely_(false),
+      reduce_memory_footprint_(false),
+      abort_incremental_marking_(false),
       compacting_(false),
       was_marked_incrementally_(false),
       collect_maps_(FLAG_collect_maps),