Add CMake extra opts for Libcxx builder

git-svn-id: https://llvm.org/svn/llvm-project/zorg/trunk@220210 91177308-0d34-0410-b5e6-96231b3b80d8
Add/change a few comments on ARM bots - no functional change

git-svn-id: https://llvm.org/svn/llvm-project/zorg/trunk@220212 91177308-0d34-0410-b5e6-96231b3b80d8
Adding Libcxx/abi on ARM buildbot

git-svn-id: https://llvm.org/svn/llvm-project/zorg/trunk@220213 91177308-0d34-0410-b5e6-96231b3b80d8
Moving libcxx ARM bot to the right place and changing to similar name

git-svn-id: https://llvm.org/svn/llvm-project/zorg/trunk@220214 91177308-0d34-0410-b5e6-96231b3b80d8