jtt will now print the complete transition tree of a given Map in gdb.

Change-Id: I07031dd3d463bec0072e8ac696406279ff057489
Reviewed-on: https://chromium-review.googlesource.com/558257
Commit-Queue: Camillo Bruni <cbruni@chromium.org>
Reviewed-by: Igor Sheludko <ishell@chromium.org>
Cr-Commit-Position: refs/heads/master@{#46437}