[lit] Remove on_clone member, which is no longer used.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@188006 91177308-0d34-0410-b5e6-96231b3b80d8
[lit] Eliminate some nested imports.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@188007 91177308-0d34-0410-b5e6-96231b3b80d8
[lit] Remove --repeat option, which wasn't that useful.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@188008 91177308-0d34-0410-b5e6-96231b3b80d8
[lit] Change --show-{tests,suites} to exit after printing.

 - This is a more sensible behavior than printing and also running tests.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@188009 91177308-0d34-0410-b5e6-96231b3b80d8
[tests] Remove dead VALGRIND and CLEANED_TESTSUITE makefile variables.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@188010 91177308-0d34-0410-b5e6-96231b3b80d8