Mark the atos-symbolizer test as unsupported on i386-darwin

atos is apparently not able to resolve symbol addresses properly on
i386-darwin reliably any more. This is causing bot flakiness:
http://lab.llvm.org:8080/green/job/clang-stage1-cmake-RA-expensive/6841

There have not been any SDK changes on the bot as of late.

/Users/buildslave/jenkins/sharedspace/clang-stage1-cmake-RA_workspace/llvm/projects/compiler-rt/test/asan/TestCases/Darwin/atos-symbolizer.cc:20:12: error: expected string not found in input
 // CHECK: #1 0x{{.*}} in main {{.*}}atos-symbolizer.cc:[[@LINE-4]]
           ^
<stdin>:35:27: note: scanning from here
 #0 0x112f56 in wrap_free (/Users/buildslave/jenkins/sharedspace/clang-stage1-cmake-RA_workspace/clang-build/lib/clang/5.0.0/lib/darwin/libclang_rt.asan_osx_dynamic.dylib:i386+0x56f56)
                          ^
<stdin>:35:27: note: with expression "@LINE-4" equal to "16"
 #0 0x112f56 in wrap_free (/Users/buildslave/jenkins/sharedspace/clang-stage1-cmake-RA_workspace/clang-build/lib/clang/5.0.0/lib/darwin/libclang_rt.asan_osx_dynamic.dylib:i386+0x56f56)
                          ^
<stdin>:36:168: note: possible intended match here
 #1 0xb6f20 in main (/Users/buildslave/jenkins/sharedspace/clang-stage1-cmake-RA_workspace/clang-build/tools/clang/runtime/compiler-rt-bins/test/asan/I386DarwinConfig/TestCases/Darwin/Output/atos-symbolizer.cc.tmp:i386+0x1f20)

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@304674 91177308-0d34-0410-b5e6-96231b3b80d8

test/asan/TestCases/Darwin/atos-symbolizer.cc

@@ -4,7 +4,7 @@
 // RUN: %env_asan_opts=verbosity=2 ASAN_SYMBOLIZER_PATH=$(which atos) not %run %t 2>&1 | FileCheck %s
 
 // Path returned by `which atos` is invalid on iOS.
-// UNSUPPORTED: ios
+// UNSUPPORTED: ios, i386-darwin
 
 #include <stdlib.h>
 #include <string.h>