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/CodeGen/InstrSched/SchedPriorities.cpp b/llvm/lib/CodeGen/InstrSched/SchedPriorities.cpp
index 31d9f6c..acbe552 100644
--- a/llvm/lib/CodeGen/InstrSched/SchedPriorities.cpp
+++ b/llvm/lib/CodeGen/InstrSched/SchedPriorities.cpp
@@ -19,7 +19,7 @@
 //**************************************************************************/
 
 #include "SchedPriorities.h"
-#include "llvm/Support/PostOrderIterator.h"
+#include "Support/PostOrderIterator.h"
 
 
 SchedPriorities::SchedPriorities(const Method* method,