[clang] [LifetimeSafety] Add suggestion and inference for implicit this (PR #176703)

[Kashika Akhouri via cfe-commits]

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@@ -137,6 +137,12 @@ OriginList *OriginManager::getOrCreateList(const Expr *E) {
     return It->second;
 
   QualType Type = E->getType();
+  // Special handling for 'this' expressions to share origins with the method's
+  // implicit object parameter.
+  if (isa<CXXThisExpr>(E)) {
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kashika0112 wrote:

I have added this here in OriginManager to be consistent with DeclRefExpr, which already manages expression-to-declaration identity mapping and origin sharing here. I was hoping that adding this here would ensure all `this` expressions share origins transparently without requiring the FactsGenerator to emit redundant flow facts.

https://github.com/llvm/llvm-project/pull/176703