Use uint16_t to store registers in callee saved register tables to reduce size of static data.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@151996 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/MachineFunction.cpp b/lib/CodeGen/MachineFunction.cpp
index bfdd738..8ab8b18 100644
--- a/lib/CodeGen/MachineFunction.cpp
+++ b/lib/CodeGen/MachineFunction.cpp
@@ -462,7 +462,7 @@
   if (!isCalleeSavedInfoValid())
     return BV;
 
-  for (const unsigned *CSR = TRI->getCalleeSavedRegs(MF); CSR && *CSR; ++CSR)
+  for (const uint16_t *CSR = TRI->getCalleeSavedRegs(MF); CSR && *CSR; ++CSR)
     BV.set(*CSR);
 
   // The entry MBB always has all CSRs pristine.