[flang][OpenMP] Implicitly capture variables in enclosing task for nested firstprivate (#183770) Fixes https://github.com/llvm/llvm-project/issues/181271 If a variable is marked firstprivate in a nested task but not actually used in the outer task body, we still need the outer task to capture it as firstprivate. Otherwise the nested task can end up pointing to the parallel region’s stack frame, which might already be gone when the deferred task runs, causing a use-after-free.
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