[Patch, Fortran, committed] Add missing fold_convert (PR36316)

[Tobias Burnus]

gfortran was generating the following tree:

    integer(kind=8) D.1026;
    integer(kind=4) D.1025;
    integer(kind=4) D.1024;
    D.1024 = D.1022->local_start;
    D.1025 = D.1022->local_end;
    D.1026 = D.1025 - D.1024;

The problem is that "D.1025-D.1024" is integer(4) while D.1026 is 
integer(8). With tree-checking enabled, this caused an ICE as Toon found 
out (thanks!).

The patch now adds the conversion.

Build, tested, check-gfortraned and committed as obvious (Rev. 136052).

Tobias

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