[clang] [LifetimeSafety] Propagate loans through the GNU binary conditional (PR #204439)

[Utkarsh Saxena via cfe-commits]

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+// RUN: %clang_cc1 -fsyntax-only -Wlifetime-safety -Wno-dangling -fcxx-exceptions -verify %s
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usx95 wrote:

There is an already existing `#ifdef __cpp_exceptions` section there, specially for the conditionals.


https://github.com/llvm/llvm-project/pull/204439