[LSan] Disable a failing test on ARM

[ostannard]

Summary

This started failing after an OS upgrade on a buildbot machine, and I don't see anything obvious to fix or revert, so disable it for now to get the bot green.

Covered by https://bugs.llvm.org/show_bug.cgi?id=44158

[DavidSpickett]

LGTM

compiler-rt/test/lsan/TestCases/stale_stack_leak.cpp

 // Test that out-of-scope local variables are ignored by LSan.
 // RUN: LSAN_BASE="report_objects=1:use_registers=0:use_stacks=1"
 // RUN: %clangxx_lsan %s -o %t
 // RUN: %env_lsan_opts=$LSAN_BASE not %run %t 2>&1 | FileCheck %s
 // RUN: %env_lsan_opts=$LSAN_BASE":exitcode=0" %run %t 2>&1 | FileCheck --check-prefix=CHECK-sanity %s
 //
 // x86 passes parameters through stack that may lead to false negatives
-// UNSUPPORTED: x86,powerpc64
+// UNSUPPORTED: x86,powerpc64,arm
 
 #include <stdio.h>
 #include <stdlib.h>
 #include "sanitizer_common/print_address.h"
 
 void **pp;
 
 // Put pointer far enough on the stack that LSan has space to run in without