PR debug/53671
PR debug/49888
* var-tracking.c (vt_get_canonicalize_base): New.
(vt_canonicalize_addr, vt_stack_offset_p): New.
(vt_canon_true_dep): New.
(drop_overlapping_mem_locs): Use vt_canon_true_dep.
(clobber_overlaping_mems): Use vt_canonicalize_addr.

From-SVN: r188871