[PatternMatch] Just check if value is a Constant before calling isAllOnesValue 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
1 file changed