use DebugLoc default ctor instead of DebugLoc::getUnknownLoc()


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@100214 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/Sparc/DelaySlotFiller.cpp b/lib/Target/Sparc/DelaySlotFiller.cpp
index 15b26c2..9e148ad 100644
--- a/lib/Target/Sparc/DelaySlotFiller.cpp
+++ b/lib/Target/Sparc/DelaySlotFiller.cpp
@@ -68,7 +68,7 @@
     if (I->getDesc().hasDelaySlot()) {
       MachineBasicBlock::iterator J = I;
       ++J;
-      BuildMI(MBB, J, DebugLoc::getUnknownLoc(), TII->get(SP::NOP));
+      BuildMI(MBB, J, DebugLoc(), TII->get(SP::NOP));
       ++FilledSlots;
       Changed = true;
     }