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

[Gábor Horváth via cfe-commits]

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@@ -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);
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Xazax-hun wrote:

I wonder if this is the right name here. We basically destructure the function call into arguments and callee. I am almost wondering if we are actually doing a version of https://clang.llvm.org/doxygen/classclang_1_1AnyCall.html 

An alternative is to reuse that (and potentially add accessors for the arguments, not just the parameters). 

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