S/390: Don't use vgm for v1ti and v1tf.

S/390: Don't use vgm for v1ti and v1tf.

gcc/ChangeLog:

2015-09-10  Andreas Krebbel  <krebbel@linux.vnet.ibm.com>

	* config/s390/s390.c (s390_contiguous_bitmask_vector_p): Reject if
	the vector element is bigger than 64 bit.

	gcc/testsuite/ChangeLog:

2015-09-10  Andreas Krebbel  <krebbel@linux.vnet.ibm.com>

	* gcc.target/s390/vector/vec-genbytemask-1.c: Add check for V1TI
	initialization with a byte mask.  No change expected here.
	* gcc.target/s390/vector/vec-genmask-1.c: Fix whitespace.
	* gcc.target/s390/vector/vec-genmask-2.c: Add check for V1TI
	initialization with contigious bitmask.  Literal pool is expectd
	to be used here.

From-SVN: r227637