[musl][atomics] Remove bespoke atomics in favor of C11 versions Change-Id: Iba2a97fbe0e696858d8f94ed5089c8dfa7685ce5
[musl] Remove the bespoke a_crash macro and just use __builtin_trap Change-Id: I6ea6a565b9f9194557cb2062a6bb4860fad3f86b
[magenta] Initial commit