[asan] Mark tests as UNSUPPORTED on arm

Temporarily mark a couple of tests as UNSUPPORTED until we figure out
why they fail on the thumb bots.

The failure was introduced in
r350139 - Add support for background thread on NetBSD in ASan.

llvm-svn: 350806

compiler-rt/test/asan/TestCases/Linux/quarantine_size_mb.cc

@@ -7,7 +7,7 @@
 // RUN: %env_asan_opts=hard_rss_limit_mb=20                         not  %run %t          2>&1 | FileCheck %s  --check-prefix=RSS_LIMIT
 
 // https://github.com/google/sanitizers/issues/981
-// UNSUPPORTED: android-26
+// UNSUPPORTED: android-26, arm
 
 #include <string.h>
 char *g;

compiler-rt/test/sanitizer_common/TestCases/hard_rss_limit_mb_test.cc

@@ -16,7 +16,7 @@
 // XFAIL: msan
 // XFAIL: ubsan
 
-// UNSUPPORTED: freebsd, solaris, darwin
+// UNSUPPORTED: freebsd, solaris, darwin, arm
 
 #include <string.h>
 #include <stdio.h>