S/390: arch13: vec_revb vector byte swap builtin

S/390: arch13: vec_revb vector byte swap builtin

gcc/ChangeLog:

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

	* config/s390/s390-builtin-types.def: Add new builtin function types.
	* config/s390/s390-builtins.def: Add overloaded builtin
	s390_vec_revb. Add low-level builtins for vlbr and vstbr
	instructions.
	* config/s390/vecintrin.h (vec_revb): New builtin name definition.
	* config/s390/vector.md (VT_HW_HSDT): New mode iterator.
	("bswap<mode>"): New expander.
	("*bswap<mode>", "*bswap<mode>_emu"): New insn definitions.

gcc/testsuite/ChangeLog:

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

	* gcc.target/s390/zvector/vec-revb-load-double-z14.c: New test.
	* gcc.target/s390/zvector/vec-revb-load-double.c: New test.
	* gcc.target/s390/zvector/vec-revb-store-double-z14.c: New test.
	* gcc.target/s390/zvector/vec-revb-store-double.c: New test.

From-SVN: r270084