MachineRegisterInfo: Remove unused arg from isConstantPhysReg(); NFC

llvm-svn: 285423
diff --git a/llvm/lib/CodeGen/MachineLICM.cpp b/llvm/lib/CodeGen/MachineLICM.cpp
index 8d59ad0..e2d00d0 100644
--- a/llvm/lib/CodeGen/MachineLICM.cpp
+++ b/llvm/lib/CodeGen/MachineLICM.cpp
@@ -895,7 +895,7 @@
         // If the physreg has no defs anywhere, it's just an ambient register
         // and we can freely move its uses. Alternatively, if it's allocatable,
         // it could get allocated to something with a def during allocation.
-        if (!MRI->isConstantPhysReg(Reg, *I.getParent()->getParent()))
+        if (!MRI->isConstantPhysReg(Reg))
           return false;
         // Otherwise it's safe to move.
         continue;