[Patch,Fortran,Committed] PR32890 - add simplifier and argument check for PACK

[Tobias Burnus]

Port from Fortran-Dev to the trunk.

See: http://gcc.gnu.org/ml/fortran/2009-03/msg00148.html
     http://gcc.gnu.org/viewcvs?view=rev&revision=145011
and followup fix
     http://gcc.gnu.org/ml/fortran/2009-03/msg00153.html
     http://gcc.gnu.org/viewcvs?view=rev&revision=145023
and PR fortran/32890

Sending        gcc/fortran/ChangeLog
Sending        gcc/fortran/check.c
Sending        gcc/fortran/intrinsic.c
Sending        gcc/fortran/intrinsic.h
Sending        gcc/fortran/simplify.c
Sending        gcc/testsuite/ChangeLog
Adding         gcc/testsuite/gfortran.dg/pack_assign_1.f90
Adding         gcc/testsuite/gfortran.dg/pack_vector_1.f90
Transmitting file data ........
Committed revision 148237.

Tobias
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