[asan] disable no-fd test on darwin

[aralisza]

Summary

If a log message is triggered between execv and child, this test fails.
In the meantime, disable the test to unblock CI

rdar://74992832

[delcypher]

LGTM

compiler-rt/test/asan/TestCases/Posix/no-fd.cpp

 // RUN: %clangxx_asan -std=c++11 -O0 %s -o %t
 // RUN: %run %t 2>&1 | FileCheck %s
 // RUN: %env_asan_opts=debug=1,verbosity=2 %run %t 2>&1 | FileCheck %s
 
 // Test ASan initialization
 
 // This test closes the 0, 1, and 2 file descriptors before an exec() and relies
 // on them remaining closed across an execve(). This is not the case on newer
 // versions of Android. On PPC with ASLR turned on, this fails when linked with
 // lld - see https://bugs.llvm.org/show_bug.cgi?id=45076.
 // UNSUPPORTED: android, powerpc
 
+// Deflake this test before reinabling for darwin (rdar://74992832)
+// UNSUPPORTED: darwin
+
 #include <assert.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <unistd.h>
 
 extern "C" const char *__asan_default_options() {
   return "test_only_emulate_no_memorymap=1";
 }