trans-expr.c (gfc_conv_substring): Check for empty substring.

trans-expr.c (gfc_conv_substring): Check for empty substring.

fortran/
* trans-expr.c (gfc_conv_substring): Check for empty substring.
testsuite/
* lib/fortran-torture.exp: Update copyright years.  Remove
obsolete comment.  Test -ftree-vectorize where it makes sense.
* lib/gfortran-dg.exp: Update copyright years.  Use settings
from fortran-torture.exp.
* gfortran.dg/char_transpose_1.f90,
gfortran.dg/char_spread_1.f90, gfortran.dg/g77/dnrm2.f,
gfortran.dg/dependent_decls_1.f90: Fixout-of-bound errors.
* gfortran.dg/enum_10.f90, gfortran.dg/mixed_io_1.f90:  Add
'-w' to dg-options.

From-SVN: r119797