[clang] [NFC][LifetimeSafety]: Track assignment history within a single CFGBlock (PR #196075)

[Utkarsh Saxena via cfe-commits]

================
@@ -0,0 +1,40 @@
+//===- AssignmentQuery.cpp - C++ Lifetime Safety Checker --------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+//
+// This file implements trackAssignmentHistory.
+//
+//===----------------------------------------------------------------------===//
+
+#include "clang/Analysis/Analyses/LifetimeSafety/AssignmentQuery.h"
+
+namespace clang::lifetimes::internal {
+void trackAssignmentHistory(
+    const FactManager &FactMgr, const LoanPropagationAnalysis &LoanPropagation,
+    llvm::SmallVectorImpl<AssignmentUnit> &AssignmentList,
+    const CFGBlock *StartBlock, OriginID StartOID, const LoanID &EndLoanID) {
+  const auto TryInsertPropagationChain = [&](const OriginFlowFact *OFF) {
+    if (OFF->getDestOriginID() == StartOID &&
+        LoanPropagation.getLoans(OFF->getSrcOriginID(), OFF)
+            .contains(EndLoanID)) {
+      const OriginID SrcOriginID = OFF->getSrcOriginID();
+      AssignmentList.push_back(FactMgr.getOriginMgr().getOrigin(SrcOriginID));
+      StartOID = SrcOriginID;
+    }
+  };
----------------
usx95 wrote:

Let us inline this.

https://github.com/llvm/llvm-project/pull/196075