[libFuzzer] Disable print_unstable_stats.test for aarch64.

Summary:
Follow-up for https://reviews.llvm.org/D50264. Reported by testbots:
http://lab.llvm.org:8011/builders/clang-cmake-aarch64-full/builds/5592

Reviewers: morehouse, kevinwkt, metzman, javed.absar, Dor1s

Reviewed By: Dor1s

Subscribers: kristof.beyls, delcypher, #sanitizers, llvm-commits, kcc

Differential Revision: https://reviews.llvm.org/D50386

llvm-svn: 339143

compiler-rt/test/fuzzer/print_unstable_stats.test

@@ -1,3 +1,6 @@
+# Tests -print_unstable_stats
+UNSUPPORTED: aarch64
+
 RUN: %cpp_compiler %S/PrintUnstableStatsTest.cpp -o %t-PrintUnstableStatsTest
 
 RUN: %run %t-PrintUnstableStatsTest -print_unstable_stats=1 -runs=100000 2>&1 | FileCheck %s --check-prefix=LONG
@@ -18,4 +21,3 @@ LONG-DAG: t3()
 LONG-DAG: t4(int, int, int)
 
 LONG-DAG: stat::stability_rate: 27.59
-