[patch, libfortran, proof of concept] maxloc for character variables

[Thomas Koenig <tkoenig at netcologne dot de>]

Hello world,

attached is a very incomplete patch for implementing
maxloc for character variables, which shows some detail
of the implementation. The very simple test program

program main
  character(len=3), dimension(3) :: a
  character(kind=4,len=1), dimension(2,2) :: b
  a(1) = '1'
  a(2) = '2'
  a(3) = '3'
  print *,maxloc(a)
  b(1,1) = 'a'
  b(2,1) = 'c'
  b(1,2) = 'b'
  b(2,2) = 'z'
  print *,maxloc(b)
end program main

works so far, but little else so far.

The work on the library side should be straightforward, if a bit 
tedious. If anything more is needed for trans-* (for the dim=1 case of
one-dimensional arrays, which is currently inlined), I'll need come back
to the list for help.

Just a heads up that I am working on this, and hope to get this
bug/missing feature in for gcc 8.  Just another feature of
F2003...

Regards

	Thomas