[llvm] [RISCV] Allow constants in tryFoldSelectIntoOp (PR #157376)

[Philip Reames via llvm-commits]

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@@ -18838,7 +18838,7 @@ static SDValue tryFoldSelectIntoOp(SDNode *N, SelectionDAG &DAG,
     break;
   }
 
-  if (!TrueVal.hasOneUse() || isa<ConstantSDNode>(FalseVal))
+  if (!TrueVal.hasOneUse())
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preames wrote:

@topperc Is there a non-obvious reason for this restriction?  It looks like you added this in the original commit that added this transform.  

https://github.com/llvm/llvm-project/pull/157376