[llvm] [Attributor] Propagate alignment through ptrmask (PR #150158)

[Matt Arsenault via llvm-commits]

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@@ -5501,6 +5555,17 @@ struct AAAlignCallSiteReturned final
   AAAlignCallSiteReturned(const IRPosition &IRP, Attributor &A)
       : Base(IRP, A) {}
 
+  ChangeStatus updateImpl(Attributor &A) override {
+    Instruction *I = getIRPosition().getCtxI();
+    if (const IntrinsicInst *II = dyn_cast<IntrinsicInst>(I)) {
+      Align Align = getAssumedAlignForIntrinsic(A, *this, *II);
+      uint64_t OldAssumed = getAssumed();
+      takeAssumedMinimum(Align.value());
+      return OldAssumed == getAssumed() ? ChangeStatus::UNCHANGED
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arsenm wrote:

Can you use clampStateAndIndicateChanged? 

https://github.com/llvm/llvm-project/pull/150158