Improved svn repo searching for 'make update'

Use a simple recursive bash function to search for svn repos for the 'make
update' target thus including projects like clang-tools-extra.

Reviewers: bkramer, echristo


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@173650 91177308-0d34-0410-b5e6-96231b3b80d8
Extracted pass ObjCARCExpand from ObjCARC.cpp => ObjCARCExpand.cpp.

I also added the local header ObjCARC.h for common functions used by the
various passes.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@173651 91177308-0d34-0410-b5e6-96231b3b80d8
Removed extraneous doxygen end module statement.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@173652 91177308-0d34-0410-b5e6-96231b3b80d8
Fixed case insensitive issue.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@173653 91177308-0d34-0410-b5e6-96231b3b80d8