[PatternMatch] Just check if value is a Constant before calling isAll…

…OnesValue for not_match. We don't really need to check for a specific subclass of Constant. NFC

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@306236 91177308-0d34-0410-b5e6-96231b3b80d8

include/llvm/IR/PatternMatch.h

@@ -946,10 +946,7 @@ template <typename LHS_t> struct not_match {
 
 private:
   bool isAllOnes(Value *V) {
-    return (isa<ConstantInt>(V) || isa<ConstantDataVector>(V) ||
-            // FIXME: Remove CV.
-            isa<ConstantVector>(V)) &&
-           cast<Constant>(V)->isAllOnesValue();
+    return isa<Constant>(V) && cast<Constant>(V)->isAllOnesValue();
   }
 };