This is a fix for two problems that caused a crash:
1. Thread-local variables sometimes are required to be parallelized.
Added a special case to handle this in
`LowerWorkshare.cpp:isSafeToParallelize`.
2. Race condition caused by a `nowait` added to the `omp.workshare` if
it is the last operation in a block. This allowed multiple threads to
execute the `omp.workshare` region concurrently. Since
_FortranAPushValue modifies a shared stack, this concurrent access
causes a crash. Disable the addition of `nowait` and rely on the
implicit barrier at the the of the `omp.workshare` region.
Fixes#143330
0f5e9bee83