[flang-commits] [flang] [flang][OpenMP] Convert default assertion into a semantic error (PR #93438)

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NimishMishra wrote:

Another probable way of handling this crash is to let the check for directives handle whether default is indeed allowed or now. During processing of a `Name`, we silently skip processing symbols (i.e. not emit any error).

Indeed, for the linked reproducer, should we silently skip without emitting any error, at a later point, another semantic error "DEFAULT clause is not allowed on the DO directive" is emitted. 

https://github.com/llvm/llvm-project/pull/93438