Make more threading improvements

- ASAN memory morgue is now lockless
- Make C11 atomics header more portable
- Rewrote pthread keys support to be lockless
- Simplify Python's unicode table unpacking code
- Make crash report write(2) closer to being atomic
- Make it possible to strace/ftrace a single thread
- ASAN now checks nul-terminated strings fast and properly
- Windows fork() now restores TLS memory of calling thread

libc/intrin/directmap-metal.c

@@ -17,8 +17,8 @@
 │ PERFORMANCE OF THIS SOFTWARE.                                                │
 ╚─────────────────────────────────────────────────────────────────────────────*/
 #include "libc/calls/calls.h"
+#include "libc/intrin/directmap.internal.h"
 #include "libc/macros.internal.h"
-#include "libc/runtime/directmap.internal.h"
 #include "libc/runtime/pc.internal.h"
 #include "libc/str/str.h"
 #include "libc/sysv/consts/map.h"
@@ -39,8 +39,7 @@ noasan struct DirectMap sys_mmap_metal(void *paddr, size_t size, int prot,
   size = ROUNDUP(size, 4096);
   addr = (uint64_t)paddr;
   if (!(flags & MAP_FIXED)) {
-    if (!addr)
-      addr = 4096;
+    if (!addr) addr = 4096;
     for (i = 0; i < size; i += 4096) {
       pte = __get_virtual(mm, pml4t, addr + i, false);
       if (pte && (*pte & (PAGE_V | PAGE_RSRV))) {