s390: This is a pre-patch for DFP support. It renames certain
identifiers to explicitly refer to BFP, as there will be counterparts
in the future for DFP. 
Patch by Maran <maranp@linux.vnet.ibm.com>.
Part of fixing #307113.


git-svn-id: svn://svn.valgrind.org/vex/trunk@2547 8f6e269a-dfd6-0310-a8e1-e2731360e62c
5 files changed