[MergeICmp] Update debug msg.NFC

llvm-svn: 329572
diff --git a/llvm/lib/Transforms/Scalar/MergeICmps.cpp b/llvm/lib/Transforms/Scalar/MergeICmps.cpp
index 5c630d9..0bfa254 100644
--- a/llvm/lib/Transforms/Scalar/MergeICmps.cpp
+++ b/llvm/lib/Transforms/Scalar/MergeICmps.cpp
@@ -367,7 +367,7 @@
                                            Block, Phi.getParent());
     Comparison.BB = Block;
     if (!Comparison.IsValid()) {
-      DEBUG(dbgs() << "skip: not a valid BCECmpBlock\n");
+      DEBUG(dbgs() << "chain with invalid BCECmpBlock, no merge.\n");
       return;
     }
     if (Comparison.doesOtherWork()) {