[C++11] Use 'nullptr'.

llvm-svn: 210442
diff --git a/llvm/lib/CodeGen/JumpInstrTables.cpp b/llvm/lib/CodeGen/JumpInstrTables.cpp
index 05a1b27c..61ef722 100644
--- a/llvm/lib/CodeGen/JumpInstrTables.cpp
+++ b/llvm/lib/CodeGen/JumpInstrTables.cpp
@@ -263,7 +263,7 @@
     if (F.hasFnAttribute(Attribute::JumpTable)) {
       assert(F.hasUnnamedAddr() &&
              "Attribute 'jumptable' requires 'unnamed_addr'");
-      Functions[&F] = NULL;
+      Functions[&F] = nullptr;
     }
   }