[flang][OpenMP] Fix privatization of threadprivate common block (#77821) In some cases, when privatizing a threadprivate common block, the original symbol will correspond to the common block, instead of its threadprivate version. This can happen, for instance, with a common block, declared in a separate module, used by a parent procedure and privatized in its child procedure. In this case, symbol lookup won't find a symbol in the parent procedure, but only in the module where the common block was defined. Fixes https://github.com/llvm/llvm-project/issues/65028
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