mpi4: large count

[hzhou]

Standard

link:
mpi-forum/mpi-issues#137
mpi-forum/mpi-issues#327
pdf: https://github.com/mpi-forum/mpi-issues/files/5503687/mpi40-report-ticket137-711c32c-6Nov2020.pdf

PR:
https://github.com/mpi-forum/mpi-standard/pull/268
https://github.com/mpi-forum/mpi-standard/pull/152

Action items

• Add large (_l) versons of C and F08 functions with count and/or displacement arguments
• Basic implementations
  ** manually add these functions
  ** add tests
• Advanced implementations
  ** implement scripts to generate MPI functions based on the python interface from the standard repository
  ** automatically generate argument validation consistently

Notes

Large count/displacement arrays may need separate internal APIs

Pull requests