[$] Supporting CHERI capabilities in GCC and glibc

The CHERIarchitecture is the product of a research program to extend commonCPU architectures in a way that prevents many types of memory-related bugs (andvulnerabilities). At the 2022 GNU Tools Cauldron,Alex Coplan and Szabolcs Nagy described the work that has been done tobring GCC and the GNU C Library (glibc) to this architecture. CHERI is a fundamentallydifferent approach to how memory is accessed, and supporting it properly is anythingbut a trivial task.