[OMPI devel] reduce_scatter_block failing on v1.7

[Eugene Loh]

The new reduce_scatter_block test is segfaulting with v1.7 but not with 
the trunk.  When we drop down into MPI_Reduce_scatter_block and attempt 
to call

comm->c_coll.coll_reduce_scatter_block()
it's NULL.  (So is comm->c_coll.coll_reduce_scatter_block_module.)

Is there some work on the trunk that should be CMRed to v1.7?