LivePhysReg: Use reference instead of pointer in init(); NFC

llvm-svn: 289002
diff --git a/llvm/lib/Target/SystemZ/SystemZShortenInst.cpp b/llvm/lib/Target/SystemZ/SystemZShortenInst.cpp
index 43f01b0..83882fc 100644
--- a/llvm/lib/Target/SystemZ/SystemZShortenInst.cpp
+++ b/llvm/lib/Target/SystemZ/SystemZShortenInst.cpp
@@ -275,7 +275,7 @@
   const SystemZSubtarget &ST = F.getSubtarget<SystemZSubtarget>();
   TII = ST.getInstrInfo();
   TRI = ST.getRegisterInfo();
-  LiveRegs.init(TRI);
+  LiveRegs.init(*TRI);
 
   bool Changed = false;
   for (auto &MBB : F)