[TSan] Support pointer authentication in setjmp/longjmp interceptors

[yln]

Summary

arm64e adds support for pointer authentication, which was adopted by
libplatform to harden setjmp/longjmp and friends. We need to teach
the TSan interceptors for those functions about this.

[yln]

Fix linter warning.

compiler-rt/lib/tsan/rtl/tsan_platform_mac.cpp

 #include <sys/time.h>
 #include <sys/types.h>
 #include <sys/resource.h>
 #include <sys/stat.h>
 #include <unistd.h>
 #include <errno.h>
 #include <sched.h>
 
+#if __has_feature(ptrauth_calls)
+#include <ptrauth.h>
+#endif
+
 namespace __tsan {
 
 #if !SANITIZER_GO
 static void *SignalSafeGetOrAllocate(uptr *dst, uptr size) {
   atomic_uintptr_t *a = (atomic_uintptr_t *)dst;
   void *val = (void *)atomic_load_relaxed(a);
   atomic_signal_fence(memory_order_acquire);  // Turns the previous load into
                                               // acquire wrt signals.
# define LONG_JMP_SP_ENV_SLOT \
     ((GetMacosVersion() >= MACOS_VERSION_MOJAVE) ? 12 : 13)
 #else
 # define LONG_JMP_SP_ENV_SLOT 2
 #endif
 
 uptr ExtractLongJmpSp(uptr *env) {
   uptr mangled_sp = env[LONG_JMP_SP_ENV_SLOT];
   uptr sp = mangled_sp ^ longjmp_xor_key;
+#if __has_feature(ptrauth_calls)
+  sp = (uptr)ptrauth_auth_data((void *)sp, ptrauth_key_asdb,
+                               ptrauth_string_discriminator("sp"));
+#endif
   return sp;
 }
 
 #if !SANITIZER_GO
 void ImitateTlsWrite(ThreadState *thr, uptr tls_addr, uptr tls_size) {
   // The pointer to the ThreadState object is stored in the shadow memory
   // of the tls.
   uptr tls_end = tls_addr + tls_size;