[rtsan] Remove mkfifoat interceptor (#116997)

This partially reverts #116915
[fce917d](fce917d)

mkfifoat was improperly guarded against in MacOS systems

Author: cjappl

compiler-rt/lib/rtsan/rtsan_interceptors_posix.cpp

@@ -746,16 +746,6 @@ INTERCEPTOR(int, mkfifo, const char *pathname, mode_t mode) {
   return REAL(mkfifo)(pathname, mode);
 }
 
-// see comment above about -Wunguarded-availability-new
-// and why we disable it here
-#pragma clang diagnostic push
-#pragma clang diagnostic ignored "-Wunguarded-availability-new"
-INTERCEPTOR(int, mkfifoat, int dirfd, const char *pathname, mode_t mode) {
-  __rtsan_notify_intercepted_call("mkfifoat");
-  return REAL(mkfifoat)(dirfd, pathname, mode);
-}
-#pragma clang diagnostic pop
-
 // Preinit
 void __rtsan::InitializeInterceptors() {
   INTERCEPT_FUNCTION(calloc);
@@ -859,7 +849,6 @@ void __rtsan::InitializeInterceptors() {
 
   INTERCEPT_FUNCTION(pipe);
   INTERCEPT_FUNCTION(mkfifo);
-  INTERCEPT_FUNCTION(mkfifoat);
 }
 
 #endif // SANITIZER_POSIX

compiler-rt/lib/rtsan/tests/rtsan_test_interceptors_posix.cpp

@@ -971,21 +971,6 @@ TEST(TestRtsanInterceptors, MkfifoDiesWhenRealtime) {
   ExpectNonRealtimeSurvival(Func);
 }
 
-#if __has_builtin(__builtin_available) && SANITIZER_APPLE
-#define MKFIFOAT_AVAILABLE() (__builtin_available(macOS 10.13, *))
-#else
-// We are going to assume this is true until we hit systems where it isn't
-#define MKFIFOAT_AVAILABLE() (true)
-#endif
-
-TEST(TestRtsanInterceptors, MkfifoatDiesWhenRealtime) {
-  if (MKFIFOAT_AVAILABLE()) {
-    auto Func = []() { mkfifoat(0, "/tmp/rtsan_test_fifo", 0); };
-    ExpectRealtimeDeath(Func, "mkfifoat");
-    ExpectNonRealtimeSurvival(Func);
-  }
-}
-
 TEST(TestRtsanInterceptors, PipeDiesWhenRealtime) {
   int fds[2];
   auto Func = [&fds]() { pipe(fds); };