Prepare for Subversion migration by implementing a -usesvn to tell the
script to to check out llvm and llvm-test from Subversion instead of CVS.
Without this option the script will continue to check out from CVS. To
specify the Subversion URL, set the SVNURL environment variable or pass
-svnurl followed by the URL. For now, -svnurl will default to Reid's
temporary (read-only, daily snapshot) SVN server. Try it out if you like!
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@35621
91177308-0d34-0410-b5e6-
96231b3b80d8