Fixup for r290119: Only run debug_alloc_stack.cc on Darwin until I figure out how to make it work on Linux.

llvm-svn: 290129

compiler-rt/test/tsan/debug_alloc_stack.cc

@@ -1,6 +1,9 @@
 // RUN: %clangxx_tsan -O0 %s -o %t
 // RUN: env %env_tsan_opts=stack_trace_format=DEFAULT %deflake %run %t 2>&1 | FileCheck %s
 
+// Until I figure out how to make this test work on Linux
+// REQUIRES: x86_64-darwin
+
 #include "test.h"
 #include <pthread.h>
 #include <stdint.h>