Support the variety of "convert to/from fixed" and "load rounded" opcodes
that have an additional m3 and/or m4 field. 
Add emulation warning EmWarn_S390X_fpext_rounding and issue it in case
the current opcode cannot be emulated correctly (i.e. with the specified
rounding mode).
New function: emulation_warning. 
Part of fixing bugzilla #306098.


git-svn-id: svn://svn.valgrind.org/vex/trunk@2501 8f6e269a-dfd6-0310-a8e1-e2731360e62c
4 files changed