PR target/83663 - Revert r255946

PR target/83663 - Revert r255946

gcc/

2018-01-08  Vidya Praveen  <vidyapraveen@arm.com>

	PR target/83663 - Revert r255946
	* config/aarch64/aarch64.c (aarch64_expand_vector_init): Modify code
	generation for cases where splatting a value is not useful.
	* simplify-rtx.c (simplify_ternary_operation): Simplify vec_merge
	across a vec_duplicate and a paradoxical subreg forming a vector
	mode to a vec_concat.

gcc/testsuite/

2018-01-08  Vidya Praveen  <vidyapraveen@arm.com>

	PR target/83663 - Revert r255946
	* gcc.target/aarch64/vect-slp-dup.c: New.

From-SVN: r256346