Changes to PPC sanitizer bots causing failures

[Nemanja Ivanovic via llvm-commits]

Hi everyone,
in case you've received notifications from PPC bots about the following
test case failures, please ignore them:

   1. FAIL: LeakSanitizer-Standalone-powerpc64::use_tls_dynamic.cc
   <http://lab.llvm.org:8011/builders/clang-ppc64be-linux-multistage/builds/7607/steps/ninja%20check%202/logs/FAIL%3A%20LeakSanitizer-Standalone-powerpc64%3A%3Ause_tls_dynamic.cc>
   2. FAIL: LeakSanitizer-AddressSanitizer-powerpc64::use_tls_dynamic.cc
   <http://lab.llvm.org:8011/builders/clang-ppc64be-linux-multistage/builds/7607/steps/ninja%20check%202/logs/FAIL%3A%20LeakSanitizer-AddressSanitizer-powerpc64%3A%3Ause_tls_dynamic.cc>
   3. FAIL: MemorySanitizer-POWERPC64:: dtls_test.c
   <http://lab.llvm.org:8011/builders/clang-ppc64be-linux-multistage/builds/7607/steps/ninja%20check%202/logs/FAIL%3A%20MemorySanitizer-POWERPC64%3A%3A%20dtls_test.c>

We have upgraded the OS on the bot machines and the kernel version in the
upgrade has a known issue that causes these failures. I am working on
disabling the test cases on PPC as they fail only on some kernels and not
others.

Thank you for your patience and sorry for the test case churn.
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