[05/46] Fix make_ssa_name call in vectorizable_reduction

[05/46] Fix make_ssa_name call in vectorizable_reduction

The usual vectoriser dance to create new assignments is:

    new_stmt = gimple_build_assign (vec_dest, ...);
    new_temp = make_ssa_name (vec_dest, new_stmt);
    gimple_assign_set_lhs (new_stmt, new_temp);

but one site in vectorizable_reduction used:

    new_temp = make_ssa_name (vec_dest, new_stmt);

before creating new_stmt.

This method of creating statements probably needs cleaning up, but
that's for another day...

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

gcc/
	* tree-vect-loop.c (vectorizable_reduction): Fix an instance in
	which make_ssa_name was called with new_stmt before new_stmt
	had been created.

From-SVN: r263120