Use uint16_t to store register overlaps to reduce static data.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@152001 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/MachineInstr.cpp b/lib/CodeGen/MachineInstr.cpp
index ff32a66..e9f9475 100644
--- a/lib/CodeGen/MachineInstr.cpp
+++ b/lib/CodeGen/MachineInstr.cpp
@@ -1533,7 +1533,7 @@
         const MachineRegisterInfo &MRI = MF->getRegInfo();
         if (MRI.use_empty(Reg) && !MRI.isLiveOut(Reg)) {
           bool HasAliasLive = false;
-          for (const unsigned *Alias = TM->getRegisterInfo()->getAliasSet(Reg);
+          for (const uint16_t *Alias = TM->getRegisterInfo()->getAliasSet(Reg);
                unsigned AliasReg = *Alias; ++Alias)
             if (!MRI.use_empty(AliasReg) || MRI.isLiveOut(AliasReg)) {
               HasAliasLive = true;