Move RegisterClassInfo.h.

Allow targets to access this API. It's required for RegisterPressure.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@158102 91177308-0d34-0410-b5e6-96231b3b80d8

lib/CodeGen/AllocationOrder.cpp

@@ -15,9 +15,9 @@
 //===----------------------------------------------------------------------===//
 
 #include "AllocationOrder.h"
-#include "RegisterClassInfo.h"
 #include "VirtRegMap.h"
 #include "llvm/CodeGen/MachineRegisterInfo.h"
+#include "llvm/CodeGen/RegisterClassInfo.h"
 
 using namespace llvm;