[llvm] [DAG][X86]added shrd in combineor for bzhiq+shlq+or (PR #125734)

[Simon Pilgrim via llvm-commits]

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@@ -51887,6 +51887,47 @@ static SDValue combineOr(SDNode *N, SelectionDAG &DAG,
     }
   }
 
+  if (!Subtarget.isSHLDSlow()) {
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RKSimon wrote:

There's not a single comment in this entire patch :( 

https://github.com/llvm/llvm-project/pull/125734