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/intrin.mk

@@ -44,6 +44,12 @@ $(LIBC_INTRIN_A).pkg:					\
 		$(LIBC_INTRIN_A_OBJS)			\
 		$(foreach x,$(LIBC_INTRIN_A_DIRECTDEPS),$($(x)_A).pkg)
 
+# we can't use asan because:
+#   __strace_init() calls this before asan is initialized
+o/$(MODE)/libc/intrin/strace_enabled.o: private		\
+		OVERRIDE_COPTS +=			\
+			-fno-sanitize=address
+
 # we can't use asan because:
 #   asan guard pages haven't been allocated yet
 o/$(MODE)/libc/intrin/directmap.o			\