[llvm] [LV] Support conditional scalar assignments of masked operations (PR #178862)

[Sander de Smalen via llvm-commits]

================
@@ -264,6 +264,23 @@ static bool isMinMaxReductionPhiWithUsersOutsideReductionChain(
   return true;
 }
 
+// This matches a phi that selects between the original value (HeaderPhi) and an
+// arbitrary non-reduction value.
+static bool isFindLastLikePhi(PHINode *Phi, PHINode *HeaderPhi,
+                              SmallPtrSetImpl<Instruction *> &ReductionInstrs) {
+  unsigned NumNonReduxInputs = 0;
+  for (const Use &Use : Phi->operands()) {
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sdesmalen-arm wrote:

nit:
```suggestion
  for (const Value *Op : Phi->operands()) {
```
(then you can also remove the `.get()` below)

https://github.com/llvm/llvm-project/pull/178862