Add LiveIntervalMap::dumpCache() to print out the cache used by the ssa update algorithm.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@123925 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/SplitKit.h b/lib/CodeGen/SplitKit.h
index 3e14dcf..3616baa 100644
--- a/lib/CodeGen/SplitKit.h
+++ b/lib/CodeGen/SplitKit.h
@@ -216,6 +216,9 @@
   // The cache is also used as a visiteed set by mapValue().
   LiveOutMap liveOutCache_;
 
+  // Dump the live-out cache to dbgs().
+  void dumpCache();
+
 public:
   LiveIntervalMap(LiveIntervals &lis,
                   MachineDominatorTree &mdt,