[flang] translate pure and elemental attribute in FIR (#109954) Follow-up from a previous patch that turned bind_c into an enum for procedure attribute. This patch carries the elemental and pure Fortran attribute into FIR so that the optimizer can leverage that info in the future (I think debug info may also need to know these aspects since DWARF has DW_AT_elemental and DW_AT_pure nodes). SIMPLE from F2023 will be translated once it is handled in the front-end. NON_RECURSIVE is only meaningful on func.func since we are not guaranteed to know that aspect on the caller side (it is not part of Fortran characteristics). There is a DW_AT_recursive DWARF node. I will do it while dealing with func.func attributes.
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