[Patch, fortran] PR37583 - ICE "insert_bbt(): Duplicate key" for self-calling ENTRY subprogram

[Paul Richard Thomas]

The attached patch fixes the problem and throws an error if the
subroutine is not recursive.

Bootstraps and regtests on x86_ia64/FC8 - OK for trunk (with a changelog)?

Paul

-- 
The knack of flying is learning how to throw yourself at the ground and miss.
 --Hitchhikers Guide to the Galaxy
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