[C++] Use 'nullptr'. Target edition.

llvm-svn: 207197
diff --git a/llvm/lib/Target/PowerPC/PPCCodeEmitter.cpp b/llvm/lib/Target/PowerPC/PPCCodeEmitter.cpp
index 84fc888..c46a094 100644
--- a/llvm/lib/Target/PowerPC/PPCCodeEmitter.cpp
+++ b/llvm/lib/Target/PowerPC/PPCCodeEmitter.cpp
@@ -102,7 +102,7 @@
   MMI = &getAnalysis<MachineModuleInfo>();
   MCE.setModuleInfo(MMI);
   do {
-    MovePCtoLROffset = 0;
+    MovePCtoLROffset = nullptr;
     MCE.startFunction(MF);
     for (MachineFunction::iterator BB = MF.begin(), E = MF.end(); BB != E; ++BB)
       emitBasicBlock(*BB);