[Flang][OpenMP] llvm-project/flang/lib/Lower/Bridge.cpp:618: virtual bool (anonymous namespace)::FirConverter::createHostAssociateVarClone(const Fortran::semantics::Symbol &): Assertion `details && "No host-association found"' failed.

Crash itself is reproducible on Godbolt
https://godbolt.org/z/q8z4GPxGT

Reproducer (flang-new -fopenmp test.f90)

$ cat test.f90
  integer :: x
  integer, external, pointer :: y
!$omp parallel private(x) firstprivate(y)
  x = y(1)
!$omp end parallel
end

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