[Ada] Unnesting: avoid unnecessary loads of System
2018-10-09 Ed Schonberg <schonberg@adacore.com> gcc/ada/ * exp_unst.adb (Unnest_Subprogram): Do not load System to obtain the Address entity unless an activation record is being built. Removes useless with_clauses for System when nested subprograms do not have uplevel references, and therefore do not need activation records. From-SVN: r264967
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