[clang] [LifetimeSafety] Add UseFacts for function arguments and assignment RHS (PR #180446)

[Utkarsh Saxena via cfe-commits]

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@@ -366,6 +366,7 @@ void FactsGenerator::VisitBinaryOperator(const BinaryOperator *BO) {
   // result should have the same loans as the pointer operand.
   if (BO->isCompoundAssignmentOp())
     return;
+  handleUse(BO->getRHS());
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usx95 wrote:

Sounds like a great idea to systematically move away from special casing `DeclRefExpr`.

I would prefer to do it in a separate PR though (https://github.com/llvm/llvm-project/pull/181693 in progress) as it involves changing a liveness, lot of tests which rely on `(void)view` being a use of `view`.

https://github.com/llvm/llvm-project/pull/180446