[llvm] [SelectionDAG] optimize sdiv with positive divisor and positive magic (PR #189287)

[Matt Arsenault via llvm-commits]

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@@ -5427,6 +5427,10 @@ class LLVM_ABI TargetLowering : public TargetLoweringBase {
                                 SelectionDAG &DAG,
                                 SmallVectorImpl<SDNode *> &Created) const;
 
+  /// Return true if the target prefers to lower constant sdiv using SRA+SUB
+  /// rather than SRL+ADD for the sign correction step.
+  virtual bool preferSDivSRASUB(EVT VT) const { return false; }
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arsenm wrote:

Don't add a new niche hook, this should be inferable with existing information 

https://github.com/llvm/llvm-project/pull/189287