Enqueue all SRA links for write flag propagation

Enqueue all SRA links for write flag propagation

2017-09-06  Martin Jambor  <mjambor@suse.cz>

	PR tree-optimization/82078
gcc/
	* tree-sra.c (sort_and_splice_var_accesses): Move call to
	add_access_to_work_queue...
	(build_accesses_from_assign): ...here.
	(propagate_all_subaccesses): Make sure racc is the group
	representative, if there is one.

gcc/testsuite/
	* gcc.dg/tree-ssa/pr82078.c: New test.

From-SVN: r251756