[Ada] Code cleanup: remove Old_Requires_Transient_Scope

[Pierre-Marie de Rodat]

This temporary code kept 3+ years ago can now be removed.

Tested on x86_64-pc-linux-gnu, committed on trunk

gcc/ada/

        * sem_util.adb (New_Requires_Transient_Scope): Renamed
        Requires_Transient_Scope.
        (Requires_Transient_Scope, Old_Requires_Transient_Scope,
        Results_Differ): Removed.
        * debug.adb: Remove -gnatdQ.

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