Enable an AddressSanitizer build with unit tests run
Series goal:
ci: Add an ASan build on x86.
I want to enable ASan runs on freedreno. It turns out it's a long road to
get there, starting with making sure we can run our unit tests with the
sanitizer enabled.
While I'm revving this container, add in valgrind too to make sure that
our build paths with valgrind enabled work.