Commits Between Branches origin/release/0.8.pre11 and release/0.8.0

81075ba 2020-09-02 Andy Chu [benchmarks] Simulate object header for copying GC.
79457e8 2020-09-03 Andy Chu [translation] Add GC header to ASDL objects.
c9a3b3e 2020-09-03 Andy Chu [release] Bump version to 0.8.0
46debba 2020-09-03 Andy Chu [build/cpython-defs] Regenerate method list.