[llvm] [LoopVectorize] Generate wide active lane masks (PR #147535)

[Kerry McLaughlin via llvm-commits]

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@@ -4288,7 +4292,13 @@ VectorizationFactor LoopVectorizationPlanner::selectVectorizationFactor() {
           if (!VPI)
             continue;
           switch (VPI->getOpcode()) {
-          case VPInstruction::ActiveLaneMask:
+          case VPInstruction::ActiveLaneMask: {
+            unsigned Multiplier =
+                cast<ConstantInt>(VPI->getOperand(2)->getLiveInIRValue())
+                    ->getZExtValue();
+            C += VPI->cost(VF * Multiplier, CostCtx);
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kmclaughlin-arm wrote:

It is also multiplied in `computeCost`; I have removed these changes.

https://github.com/llvm/llvm-project/pull/147535