[clang] [LifetimeSafety] Fix crash on explicit object member functions (PR #212154)

[Utkarsh Saxena via cfe-commits]

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@@ -929,6 +930,8 @@ void FactsGenerator::handleMovedArgsInCall(const FunctionDecl *FD,
   for (unsigned I = IsInstance;
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usx95 wrote:

nit: `// Skip implicit 'this'` ...

https://github.com/llvm/llvm-project/pull/212154