s390: New machine model: zBC12


git-svn-id: svn://svn.valgrind.org/valgrind/trunk@13473 a5019735-40e9-0310-863c-91ae7b9d1cf9
s390: Announce support for DFP. Update the opcode spreadsheet
to reflect this.


git-svn-id: svn://svn.valgrind.org/valgrind/trunk@13474 a5019735-40e9-0310-863c-91ae7b9d1cf9