[flang] Address OpenACC name resolution gaps (#164313) Some OpenACC parsers aren't filling in the "source" data members of parse tree nodes, or not doing so correctly; and some of those nodes are not adding their source data members to the source ranges of the current scope when being visited in name resolution, which causes SemanticsContext::FindScope() to misidentify the current scope in directive resolution when creating contexts. Further, the name resolution for a "use_device" clause isn't walking its subtrees, so some parser::Name nodes are not being resolved to Symbols. Fix these problems, and clean up resolve-directives.cpp a bit, since most Name nodes don't need to have their symbol table pointers updated now.
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