[Bug tree-optimization/70256] Add debug_varinfo and debug_varmap

[vries at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70256

--- Comment #3 from vries at gcc dot gnu.org ---
Approved for stage1: https://gcc.gnu.org/ml/gcc-patches/2016-03/msg00912.html