[libc builder] Add custom step for AOR tests.

Summary:
Add customer step to non-asan buildbot to run `make check`. These tests from AOR are meant to act as regression tests until AORs are merged into libc.

Tested locally.

Reviewers: sivachandra

Reviewed By: sivachandra

Tags: #libc-project, #zorg

Differential Revision: https://reviews.llvm.org/D76331
1 file changed