Add debug output for rematerializable instructions.

llvm-svn: 129883
diff --git a/llvm/lib/CodeGen/LiveRangeEdit.h b/llvm/lib/CodeGen/LiveRangeEdit.h
index 54a2c83..c008d76 100644
--- a/llvm/lib/CodeGen/LiveRangeEdit.h
+++ b/llvm/lib/CodeGen/LiveRangeEdit.h
@@ -137,7 +137,7 @@
 
   /// checkRematerializable - Manually add VNI to the list of rematerializable
   /// values if DefMI may be rematerializable.
-  void checkRematerializable(VNInfo *VNI, const MachineInstr *DefMI,
+  bool checkRematerializable(VNInfo *VNI, const MachineInstr *DefMI,
                              const TargetInstrInfo&, AliasAnalysis*);
 
   /// Remat - Information needed to rematerialize at a specific location.