Fix the count of the number of instructions removed

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@11049 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Transforms/Scalar/ADCE.cpp

@@ -144,6 +144,7 @@ bool ADCE::dropReferencesOfDeadInstructionsInLiveBlock(BasicBlock *BB) {
         // Delete the instruction...
         I = BB->getInstList().erase(I);
         Changed = true;
+        ++NumInstRemoved;
       } else {
         ++I;
       }