[autoconf] Add Transform/ directory

Contributed-by: Sam Novak <snovak@uwsp.edu>

git-svn-id: https://llvm.org/svn/llvm-project/polly/trunk@203868 91177308-0d34-0410-b5e6-96231b3b80d8
Allow several polly command line options to be provided multiple times

Contributed-by: Sam Novak <snovak@uwsp.edu>

git-svn-id: https://llvm.org/svn/llvm-project/polly/trunk@203869 91177308-0d34-0410-b5e6-96231b3b80d8
[libpluto] Make more pluto options accessible

Contributed-by: Sam Novak <snovak@uwsp.edu>

git-svn-id: https://llvm.org/svn/llvm-project/polly/trunk@203871 91177308-0d34-0410-b5e6-96231b3b80d8