[llvm] [VPlan] Use VPTypeAnalysis to get the step type of widen pointer induction (PR #147925)

[David Sherwood via llvm-commits]

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@@ -854,8 +854,8 @@ optimizeLatchExitInductionUser(VPlan &Plan, VPTypeAnalysis &TypeInfo,
   if (ScalarTy->isIntegerTy())
     return B.createNaryOp(Instruction::Sub, {EndValue, Step}, {}, "ind.escape");
   if (ScalarTy->isPointerTy()) {
-    auto *Zero = Plan.getOrAddLiveIn(
-        ConstantInt::get(Step->getLiveInIRValue()->getType(), 0));
+    Type *StepTy = TypeInfo.inferScalarType(Step);
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david-arm wrote:

Without seeing the test before this patch I can't really tell what effect it had. Could you have a separate commit for the test so we can see the change?

https://github.com/llvm/llvm-project/pull/147925