[clang] [Lifetime Safety] Highlight lifetimebound calls in alias chain diagnostics (PR #206337)

[Gábor Horváth via cfe-commits]

================
@@ -56,6 +60,25 @@ getImplicitObjectParamLifetimeBoundAttr(const FunctionDecl *FD);
 /// method or because it's a normal assignment operator.
 bool implicitObjectParamIsLifetimeBound(const FunctionDecl *FD);
 
+using LifetimeBoundParamInfo =
+    llvm::PointerUnion<const ParmVarDecl *, const CXXMethodDecl *>;
+
+/// Returns the callee and arguments corresponding to Call. For instance member
+/// calls, Args includes the implicit object argument as argument 0.
+std::pair<const FunctionDecl *, llvm::SmallVector<const Expr *, 4>>
+getFunctionCallInfo(const Expr *Call);
+
+/// Returns the parameter corresponding to argument I when the argument should
+/// be tracked for lifetime safety.
+std::optional<LifetimeBoundParamInfo>
+getTrackedArgInfo(const FunctionDecl *FD, llvm::ArrayRef<const Expr *> Args,
----------------
Xazax-hun wrote:

Do we need both overloads? 

https://github.com/llvm/llvm-project/pull/206337