S/390: arch13: Support new popcount instruction

S/390: arch13: Support new popcount instruction
 variant.

The new arch13 popcount instruction counts bits in the entire 64 bit
register instead of just in 8 bit portions.

gcc/ChangeLog:

2019-04-02  Andreas Krebbel  <krebbel@linux.ibm.com>

	* config/s390/s390.md ("*popcountdi_arch13_cc")
	("*popcountdi_arch13_cconly", "*popcountdi_arch13"): New insn
	definition.
	("*popcount<mode>", "popcountdi2", "popcountsi2", "popcounthi2"):
	Append _z196 to make it ...
	("*popcount<mode>_z196", "popcountdi2_z196", "popcountsi2_z196")
	("popcounthi2_z196"): ... this.
	("popcountdi2_z196"): Remove TARGET_64BIT from the insn condition.
	("popcountdi2", "popcountsi2", "popcounthi2"): New expanders.

gcc/testsuite/ChangeLog:

2019-04-02  Andreas Krebbel  <krebbel@linux.ibm.com>

	* gcc.target/s390/arch13/popcount-1.c: New test.

From-SVN: r270079