[C++] Use 'nullptr'.

llvm-svn: 207394
diff --git a/llvm/lib/TableGen/TGParser.cpp b/llvm/lib/TableGen/TGParser.cpp
index f94c6f6..dd3a096 100644
--- a/llvm/lib/TableGen/TGParser.cpp
+++ b/llvm/lib/TableGen/TGParser.cpp
@@ -115,7 +115,7 @@
 
     // We should have a BitsInit type now.
     BitsInit *BInit = dyn_cast<BitsInit>(BI);
-    assert(BInit != 0);
+    assert(BInit != nullptr);
 
     SmallVector<Init *, 16> NewBits(CurVal->getNumBits());