Put 'Idempotent operations' static analyzer issues in the 'Dead code' category.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@109517 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Checker/IdempotentOperationChecker.cpp b/lib/Checker/IdempotentOperationChecker.cpp
index 48b5a59..95d488c 100644
--- a/lib/Checker/IdempotentOperationChecker.cpp
+++ b/lib/Checker/IdempotentOperationChecker.cpp
@@ -348,7 +348,8 @@
       // Create the SourceRange Arrays
       SourceRange S[2] = { i->first->getLHS()->getSourceRange(),
                            i->first->getRHS()->getSourceRange() };
-      B.EmitBasicReport("Idempotent operation", msg, i->first->getOperatorLoc(),
+      B.EmitBasicReport("Idempotent operation", "Dead code",
+                        msg, i->first->getOperatorLoc(),
           S, 2);
     }
   }