S/390: Mode attrs "bitoff[_plus]" simplify risbg instructions.

S/390: Mode attrs "bitoff[_plus]" simplify risbg instructions.

Add a new mode attribute to simplify some instruction patterns.

gcc/ChangeLog:

2016-09-23  Dominik Vogt  <vogt@linux.vnet.ibm.com>

	* config/s390/s390.md (bitoff, bitoff_plus): Neq mode attributes.
	("*extzv<mode>_zEC12", "*insv<mode>_zEC12", "*insv<mode>_z10")
	("*insv<mode>_zEC12_appendbitsleft")
	("*insv<mode>_z10_appendbitsleft", "*r<noxa>sbg_<mode>_sll")
	("*r<noxa>sbg_<mode>_srl"): Use new attributes.

gcc/testsuite/ChangeLog:

2016-09-23  Dominik Vogt  <vogt@linux.vnet.ibm.com>

	* gcc.target/s390/md/rXsbg_mode_sXl.c: Adapt expected assembly
	output to the simplified instructions.

From-SVN: r240409