Oops, forgot to commit this file.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@43867 91177308-0d34-0410-b5e6-96231b3b80d8

include/llvm/CodeGen/LiveVariables.h

@@ -83,6 +83,10 @@ public:
     ///
     BitVector AliveBlocks;
 
+    /// UsedBlocks - Set of blocks of which this value is actually used. This
+    /// is a bit set which uses the basic block number as an index.
+    BitVector UsedBlocks;
+
     /// NumUses - Number of uses of this register across the entire function.
     ///
     unsigned NumUses;