[Flang][OpenMP] Fix copyin allocatable lowering to MLIR (#122097) Fixes https://github.com/llvm/llvm-project/issues/113191 Issue: [flang][OpenMP] Runtime segfault when an allocatable variable is used with copyin Rootcause: The value of the threadprivate variable is not being copied from the primary thread to the other threads within a parallel region. As a result it tries to access a null pointer inside a parallel region which causes segfault. Fix: When allocatables used with copyin clause need to ensure that, on entry to any parallel region each thread’s copy of a variable will acquire the allocation status of the primary thread, before copying the value of a threadprivate variable of the primary thread to the threadprivate variable of each other member of the team.
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