Fix llvm-cov test as suggested in r196228's post commit review.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@196255 91177308-0d34-0410-b5e6-96231b3b80d8
Further fix to llvm-cov test.

It turns out that in some build systems, tests are executed in a
non-writable directory. Hopefully, this finally fixes the issue.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@196256 91177308-0d34-0410-b5e6-96231b3b80d8
Disable Remote MCJIT tests on ARM

The communication protocol is unstable on ARM when compiled
with Clang, which is disrupting the self-hosting buildbots that
are going to be added this week. I'm working on a solution, but
remote MCJIT is not high-priority for ARM at the moment, so it
might take a while.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@196257 91177308-0d34-0410-b5e6-96231b3b80d8