* sem_prag.adb (Analyze_Pragma): Extensions_Visible can now
apply to an expression function.
* sem_util.adb (Extensions_Visible_Status): Add special processing
for expression functions.
* inline.adb (Build_Body_To_Inline): Remove meaningless aspects
and pragmas.
(Generate_Subprogram_Body): Remove meaningless aspects and pragmas.
(Remove_Aspects_And_Pragmas): New routine.
(Remove_Pragmas): Removed.
* namet.ads, namet.adb (Nam_In): New versions of the routine.