[libFuzzer] Disable value-profile-cmp.test and fuzzer-oom.test on ARM64

value-profile-cmp was always flaky, and OOM fails to work in some environments.
counters.test fails when vectorization is enabled, and it is more likely
to kick in when compiling for ARM.

Differential Revision: https://reviews.llvm.org/D54004

llvm-svn: 346193