[NFC][RegAlloc] InlineSpiller::Original is a Register

GitOrigin-RevId: 3a030c2f2fe3de62c5eba4f916ce51e5d1214a42
diff --git a/lib/CodeGen/InlineSpiller.cpp b/lib/CodeGen/InlineSpiller.cpp
index 876e1d3..c315043 100644
--- a/lib/CodeGen/InlineSpiller.cpp
+++ b/lib/CodeGen/InlineSpiller.cpp
@@ -173,7 +173,7 @@
   LiveRangeEdit *Edit;
   LiveInterval *StackInt;
   int StackSlot;
-  unsigned Original;
+  Register Original;
 
   // All registers to spill to StackSlot, including the main register.
   SmallVector<Register, 8> RegsToSpill;