976641062e
As mentioned at <https://github.com/llvm/llvm-project/pull/126156#discussion_r1953523892>: PR #126156 causes AliasAnalysis::getSource to sometimes return SourceKind::Unknown when it used to return SourceKind::Indirect for a LoadOp. This patch restores that part of the old behavior. It should not affect user-visible behavior because AliasAnalysis::alias treats SourceKind::Unknown and SourceKind::Indirect equivalently, but it does improve debugging output.