[llvm] [SDAG] Convert `SDNodeFlags` into an enumeration (PR #114061)

[via llvm-commits]

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@@ -2892,11 +2892,11 @@ SDValue DAGCombiner::visitADDLike(SDNode *N) {
         if (N->getFlags().hasNoUnsignedWrap() &&
             N0->getFlags().hasNoUnsignedWrap() &&
             N0.getOperand(0)->getFlags().hasNoUnsignedWrap()) {
-          Flags.setNoUnsignedWrap(true);
+          Flags = SDNodeFlags::NoUnsignedWrap;
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goldsteinn wrote:

Here and below, imo just make it all `|=`.

https://github.com/llvm/llvm-project/pull/114061