* config/s390/s390.c (s390_preferred_reload_class): Do not
force constants to the pool unless necessary.
(s390_decompose_address): Prefer to use pointer as base,
not index register.
* config/s390/s390.md ("*tsthiCCT_only"): Remove '?' from
Q alternative.
("*movdi_64", "*movsi", "movhi", "movqi_64", "movqi",
"*movdf_64", "*movsf"): Add '?' to Q->Q alternatives.
("*extractqi", "*extracthi", "*zero_extendhisi2_31",
"*zero_extendqisi2_31", "*zero_extendqihi2_31",
"*adddi3_31", "*subdi3_31"): Do not set "type" attribute.
From-SVN: r64583
