[dwarf,patch] Set calling convention to DW_CC_program for Fortran main program

[FX Coudert]

Attached patch sets the DW_AT_calling_convention of the Fortran main  
program to DW_CC_program (see http://www.sourceware.org/ml/gdb/ 
2007-10/msg00205.html for the decision to do so). It's  
straightforward, but needs a debug-info maintainer approval.

Regtested on x86_64-linux, and tested with gdb mainline. OK to commit?


FX

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