[Patch,Fortran] PR45186 - P2 regression - gfortran 4.6 emits wrong line numbers

[Tobias Burnus]

  This is part 1 of the fix for PR fortran/45186; it changes a couple of 
"fold_build[0-9]" to "fold_build[0-9]_loc(input_location,".

In order to fully fix the P2 (!) regression, one needs to change all 
fold_build, fix some locations which are wrong (i.e. where 
input_location is not the correct position), and possibly a bit more.

Remaining: 622 folds_builds, namely
trans-array.c:198
trans.c:51
trans-expr.c:94
trans-intrinsic.c:216
trans-io.c:29
trans-openmp.c:34

Built and currently regtesting on x86-64-linux.
OK for the trunk? (Assuming that there are no testsuite failures.)

Tobias
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