PR debug/52983
* valtrack.h, valtrack.c: New.
* Makefile.in (VALTRACK_H): New.
(OBJS): Add valtrack.o.
(valtrack.o): New.
(cselib.o, dce.o, df-problems.o, combine.o): Add VALTRACK_H.
* combine.c: Include valtrack.h.
(make_compound_operation): Publish.
(cleanup_auto_inc_dec): Move to valtrack.c.
(struct rtx_subst_pair, propagate_for_debug_subst): Likewise.
(propagate_for_debug): Likewise.  Add this_basic_block parameter.
Adjust all callers.
* cselib.c: Include valtrack.h.
* dce.c: Likewise.
* df-problems.c: Likewise.
(dead_debug_init, dead_debug_reset_uses): Move to valtrack.c.
(dead_debug_finish, dead_debug_add): Likewise.
(dead_debug_insert_temp): Likewise.
* df.h (struct dead_debug_use): Move to valtrack.h.
(struct dead_debug, enum debug_temp_where): Likewise.
(dead_debug_init, dead_debug_reset_uses): Move to valtrack.h.
(dead_debug_finish, dead_debug_add): Likewise.
(dead_debug_insert_temp): Likewise.
* rtl.h (make_compound_operation): Declare.

From-SVN: r190061