[Flang][Semantics] Allow declare target to be used on functions external to the declare targets scope (#122546) Whilst a little contrived, OpenMP allows you to utilise declare target in the scope of one function to mark another function declare target, currently this leads to a semantic error. This appears to be because when we process the declare target directive in the scope of another function (referring to another function), we do not search externally from that functions scope to find possible prior definitions, we only search in the current scope, this leads to us implicitly defining a new variable and using that when implicit none is not specified and then error'ng out or error'ng out earlier when implict none is defined. This patch tries to address this behaviour by looking externally for a function first and using that, before defaulting back to the prior behaviour.
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