[SCEV] Fix stylistic issue in MatchBinaryAddToConst; NFCI

Instead of checking `(FlagsPresent & ExpectedFlags) != 0`, check
`(FlagsPresent & ExpectedFlags) == ExpectedFlags`.  Right now they're
equivalent since `ExpectedFlags` can only be either `FlagNUW` or
`FlagNSW`, but if we ever pass in `ExpectedFlags` as `FlagNUW | FlagNSW`
then checking `(FlagsPresent & ExpectedFlags) != 0` would be wrong.

llvm-svn: 251142

llvm/lib/Analysis/ScalarEvolution.cpp

@@ -7191,7 +7191,7 @@ bool ScalarEvolution::isKnownPredicateViaNoOverflow(ICmpInst::Predicate Pred,
       return false;
 
     OutY = cast<SCEVConstant>(ConstOp)->getValue()->getValue();
-    return (FlagsPresent & ExpectedFlags) != 0;
+    return (FlagsPresent & ExpectedFlags) == ExpectedFlags;
   };
 
   APInt C;