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/ARM/Thumb2InstrInfo.cpp b/lib/Target/ARM/Thumb2InstrInfo.cpp
index 55163f9..de46056 100644
--- a/lib/Target/ARM/Thumb2InstrInfo.cpp
+++ b/lib/Target/ARM/Thumb2InstrInfo.cpp
@@ -41,7 +41,7 @@
                               unsigned DestReg, unsigned SrcReg,
                               const TargetRegisterClass *DestRC,
                               const TargetRegisterClass *SrcRC) const {
-  DebugLoc DL = DebugLoc::getUnknownLoc();
+  DebugLoc DL;
   if (I != MBB.end()) DL = I->getDebugLoc();
 
   if (DestRC == ARM::GPRRegisterClass &&
@@ -66,7 +66,7 @@
 storeRegToStackSlot(MachineBasicBlock &MBB, MachineBasicBlock::iterator I,
                     unsigned SrcReg, bool isKill, int FI,
                     const TargetRegisterClass *RC) const {
-  DebugLoc DL = DebugLoc::getUnknownLoc();
+  DebugLoc DL;
   if (I != MBB.end()) DL = I->getDebugLoc();
 
   if (RC == ARM::GPRRegisterClass || RC == ARM::tGPRRegisterClass) {
@@ -90,7 +90,7 @@
 loadRegFromStackSlot(MachineBasicBlock &MBB, MachineBasicBlock::iterator I,
                      unsigned DestReg, int FI,
                      const TargetRegisterClass *RC) const {
-  DebugLoc DL = DebugLoc::getUnknownLoc();
+  DebugLoc DL;
   if (I != MBB.end()) DL = I->getDebugLoc();
 
   if (RC == ARM::GPRRegisterClass || RC == ARM::tGPRRegisterClass) {