improve debug of codegen

improve debug of codegen

- fix printing of ISL stmt and parameter names
- move dot_scop* functions outside of anonymous namespace.

  * graphite-isl-ast-to-gimple.c: Include tree-cfg.h.
  (translate_isl_ast_node_user): Add more dumps: call print_loops_bb.
  * graphite-scop-detection.c (dot_all_scops_1): Moved out of
  anonymous namespace.
  * graphite-sese-to-poly.c (ssa_name_version_typesize): Remove.
  (isl_id_for_pbb): Use a buffer of size 10.
  (isl_id_for_ssa_name): Same.
  * sese.c (set_rename): Add more dumps.

Co-Authored-By: Sebastian Pop <s.pop@samsung.com>
From-SVN: r229782