Renaming perf. main files from main.cpp to something meaningful

git-svn-id: https://llvm.org/svn/llvm-project/lldb/trunk@177587 91177308-0d34-0410-b5e6-96231b3b80d8
Making the test step count a member variable so that it can be accessed easily

git-svn-id: https://llvm.org/svn/llvm-project/lldb/trunk@177594 91177308-0d34-0410-b5e6-96231b3b80d8