[llvm] [SelectionDAG] Add space-optimized forms of OPC_CheckComplexPat (PR #73310)

[Matt Arsenault via llvm-commits]

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@@ -602,6 +601,7 @@ bool MatcherGen::EmitMatcherCode(unsigned Variant) {
 
     // Emit a CheckComplexPat operation, which does the match (aborting if it
     // fails) and pushes the matched operands onto the recorded nodes list.
+    CGP.increaseComplexPatternUsage(CP);
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arsenm wrote:

Could you have done this before the actual emission to keep the const during emission?

https://github.com/llvm/llvm-project/pull/73310