[Patch, fortran] PR31474 - ENTRY & procedural pointer: insert_bbt(): Duplicate key found!

[Paul Thomas]

:ADDPATCH fortran:

This PR and its fix are straightforward.  The ChangeLog and the comments 
say it all.  The testcase is based on the original.

Bootstarpped and regtested on amd64/suse10.1 - OK for trunk?

Paul
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