[Clang][OpenMP] Add codegen test for reduction capture under nested default(firstprivate) Add a CodeGen regression test covering a taskloop with default(firstprivate) and a reduction nested inside a 'taskgraph' region. It asserts the reduction variable is captured by reference by the enclosing taskgraph (its address is stored into the captured record) and that the caller reads the reduced value back out of that same storage. This guards the Sema fix that consults the capture level's default DSA rather than the innermost directive's. Assisted-By: Claude Opus 4.8 Pull Request: https://github.com/llvm/llvm-project/pull/216331
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