[llvm] [SDPatternMatch] Remove MatchContext (PR #218372)

[Simon Pilgrim via llvm-commits]

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@@ -4646,26 +4646,26 @@ SDValue DAGCombiner::visitSUB(SDNode *N) {
 
   // smax(a,b) - smin(a,b) --> abds(a,b)
   if ((!LegalOperations || hasOperation(ISD::ABDS, VT)) &&
-      sd_match(N0, &DAG, m_SMaxLike(m_Value(A), m_Value(B))) &&
-      sd_match(N1, &DAG, m_SMinLike(m_Specific(A), m_Specific(B))))
+      sd_match(N0, m_SMaxLike(DAG, m_Value(A), m_Value(B))) &&
+      sd_match(N1, m_SMinLike(DAG, m_Specific(A), m_Specific(B))))
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RKSimon wrote:

Sorry, but I really don't like the idea of having to repeatedly include DAG down a pattern chain like this

https://github.com/llvm/llvm-project/pull/218372