Make considerably more progress on AARCH64

- Utilities like pledge.com now build
- kprintf() will no longer balk at 48-bit addresses
- There's a new aarch64-dbg build mode that should work
- gc() and defer() are mostly pacified; avoid using them on aarch64
- THIRD_PART_STB now has Arm Neon intrinsics for fast image handling

libc/intrin/asan.c

@@ -47,10 +47,9 @@
 #include "libc/sysv/errfuns.h"
 #include "libc/thread/tls.h"
 #include "third_party/dlmalloc/dlmalloc.h"
-
 #ifdef __x86_64__
+
 STATIC_YOINK("_init_asan");
-#endif
 
 #if IsModeDbg()
 // MODE=dbg
@@ -1505,3 +1504,5 @@ void __asan_init(int argc, char **argv, char **envp, intptr_t *auxv) {
   STRACE("/_/   \\_\\____/_/   \\_\\_| \\_|");
   STRACE("cosmopolitan memory safety module initialized");
 }
+
+#endif /* __x86_64__ */