Backport PRs 90328, 90402, 90450, 90474

Backport PRs 90328, 90402, 90450, 90474

2019-06-06  Richard Biener  <rguenther@suse.de>

	Backport from mainline
	2019-05-22  Richard Biener  <rguenther@suse.de>

	PR tree-optimization/90450
	* tree-ssa-loop-im.c (struct im_mem_ref): Add ref_decomposed.
	(mem_ref_hasher::equal): Check it.
	(mem_ref_alloc): Initialize it.
	(gather_mem_refs_stmt): Set it.

	2019-05-15  Richard Biener  <rguenther@suse.de>

	PR c/90474
	* c-common.c (c_common_mark_addressable_vec): Also mark
	a COMPOUND_LITERAL_EXPR_DECL addressable similar to
	c_mark_addressable.

	2019-05-13  Richard Biener  <rguenther@suse.de>

	PR tree-optimization/90402
	* tree-if-conv.c (tree_if_conversion): Value number only
	the loop body by making the latch an exit of the region
	as well.
	* tree-ssa-sccvn.c (process_bb): Add flag whether to skip
	processing PHIs.
	(do_rpo_vn): Deal with multiple edges into the entry block
	that are not backedges inside the region by skipping PHIs
	of the entry block.

	* gcc.dg/torture/pr90402-1.c: New testcase.

	2019-05-06  Richard Biener  <rguenther@suse.de>

	PR tree-optimization/90328
	* tree-data-ref.h (dr_may_alias_p): Pass in the actual loop nest.
	* tree-data-ref.c (dr_may_alias_p): Check whether the clique
	is valid in the loop nest before using it.
	(initialize_data_dependence_relation): Adjust.
	* graphite-scop-detection.c (build_alias_set): Pass the SCOP enclosing
	loop as loop-nest to dr_may_alias_p.

	* gcc.dg/torture/pr90328.c: New testcase.

From-SVN: r271995