2019-07-02  Richard Biener  <rguenther@suse.de>

	* tree-core.h (enum tree_index): Add TI_CHREC_DONT_KNOW and
	TI_CHREC_KNOWN.
	* tree.h (chrec_not_analyzed_yet, chrec_dont_know, chrec_known):
	Define here.
	* tree.c (build_common_tree_nodes): Initialize them.
	* tree-chrec.h (chrec_not_analyzed_yet, chrec_dont_know, chrec_known):
	Make declarations comments.
	* tree-scalar-evolution.c (chrec_not_analyzed_yet, chrec_dont_know,
	chrec_known): Remove definitions.
	(initialize_scalar_evolutions_analyzer): Remove.
	(scev_initialize): Do not call initialize_scalar_evolutions_analyzer.
	* tree-streamer.c (preload_common_nodes): Do not preload
	TI_CHREC_DONT_KNOW or TI_CHREC_KNOWN.

From-SVN: r272928