Update information about compiler used during linux tests and reformat run information.

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@214483 91177308-0d34-0410-b5e6-96231b3b80d8
Adding ABI information to linux test results

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@214484 91177308-0d34-0410-b5e6-96231b3b80d8