BBVectorize: Check the types of compare instructions

The pass would previously assert when trying to compute the cost of
compare instructions with illegal vector types (like struct pointers).

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@167743 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Transforms/Vectorize/BBVectorize.cpp

@@ -485,6 +485,8 @@ namespace {
         T2 = SI->getCondition()->getType();
       } else if (ShuffleVectorInst *SI = dyn_cast<ShuffleVectorInst>(I)) {
         T2 = SI->getOperand(0)->getType();
+      } else if (CmpInst *CI = dyn_cast<CmpInst>(I)) {
+        T2 = CI->getOperand(0)->getType();
       }
     }