Create a new #include "Support/..." directory structure to move things
from "llvm/Support/..." that are not llvm dependant.

Move files and fix #includes

llvm-svn: 1400
diff --git a/llvm/lib/Analysis/LoopInfo.cpp b/llvm/lib/Analysis/LoopInfo.cpp
index a240ec8..40a195b 100644
--- a/llvm/lib/Analysis/LoopInfo.cpp
+++ b/llvm/lib/Analysis/LoopInfo.cpp
@@ -9,8 +9,8 @@
 
 #include "llvm/Analysis/LoopInfo.h"
 #include "llvm/Analysis/Dominators.h"
-#include "llvm/Support/DepthFirstIterator.h"
 #include "llvm/BasicBlock.h"
+#include "Support/DepthFirstIterator.h"
 #include <algorithm>
 
 bool cfg::Loop::contains(const BasicBlock *BB) const {