Create a new #include "Support/..." directory structure to move things

from "llvm/Support/..." that are not llvm dependant.

Move files and fix #includes


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@1400 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Transforms/Scalar/DCE.cpp

@@ -24,7 +24,6 @@
 //===----------------------------------------------------------------------===//
 
 #include "llvm/Optimizations/DCE.h"
-#include "llvm/Support/STLExtras.h"
 #include "llvm/Module.h"
 #include "llvm/GlobalVariable.h"
 #include "llvm/Method.h"
@@ -32,6 +31,7 @@
 #include "llvm/iTerminators.h"
 #include "llvm/iOther.h"
 #include "llvm/Assembly/Writer.h"
+#include "Support/STLExtras.h"
 #include <algorithm>
 
 // dceInstruction - Inspect the instruction at *BBI and figure out if it's