make tests pass

Summary: 'make test' was failing for me on libtooling, so I re-recorded them, and added a simple one for the "this" keyword because the next construction I'm looking at is CXXThisExpr

Test Plan: make -C libtooling/ test

Reviewers: mathieubaudet

Reviewed By: mathieubaudet

Differential Revision: https://phabricator.fb.com/D1428719

Tasks: 3964417