graphic: 0.896
device: 0.800
instruction: 0.597
semantic: 0.540
socket: 0.512
boot: 0.509
network: 0.445
vnc: 0.434
mistranslation: 0.286
other: 0.137
KVM: 0.075
assembly: 0.030

s390x floating point conversion functions broken
Description of problem:
While collecting additional reference files for float_convs (and float_convd) I noticed that the s390x handling of some cases is broken. See diff for details:

```
 diff -y tests/tcg/s390x-linux-user/float_convs.out ../../tests/tcg/s390x/float_convs.ref
#