[15/46] Make SLP_TREE_VEC_STMTS a vec<stmt_vec_info>

[15/46] Make SLP_TREE_VEC_STMTS a vec<stmt_vec_info>

This patch changes SLP_TREE_VEC_STMTS from a vec<gimple *> to a
vec<stmt_vec_info>.  This involved making the same change to the
phis vector in vectorizable_reduction, since SLP_TREE_VEC_STMTS is
spliced into it here:

  phis.splice (SLP_TREE_VEC_STMTS (slp_node_instance->reduc_phis));

2018-07-31  Richard Sandiford  <richard.sandiford@arm.com>

gcc/
	* tree-vectorizer.h (_slp_tree::vec_stmts): Change from a
	vec<gimple *> to a vec<stmt_vec_info>.
	* tree-vect-loop.c (vect_create_epilog_for_reduction): Change
	the reduction_phis argument from a vec<gimple *> to a
	vec<stmt_vec_info>.
	(vectorizable_reduction): Likewise the phis local variable that
	is passed to vect_create_epilog_for_reduction.  Update for new type
	of SLP_TREE_VEC_STMTS.
	(vectorizable_induction): Update for new type of SLP_TREE_VEC_STMTS.
	(vectorizable_live_operation): Likewise.
	* tree-vect-slp.c (vect_get_slp_vect_defs): Likewise.
	(vect_transform_slp_perm_load, vect_schedule_slp_instance): Likewise.

From-SVN: r263130