[C++11] More 'nullptr' conversion. In some cases just using a boolean check instead of comparing to nullptr.

llvm-svn: 206254
diff --git a/llvm/utils/TableGen/CodeGenMapTable.cpp b/llvm/utils/TableGen/CodeGenMapTable.cpp
index b97126b..7e5aa9c 100644
--- a/llvm/utils/TableGen/CodeGenMapTable.cpp
+++ b/llvm/utils/TableGen/CodeGenMapTable.cpp
@@ -326,7 +326,7 @@
   const std::vector<Record*> &RelatedInstrVec = RowInstrMap[KeyValue];
 
   ListInit *ColFields = InstrMapDesc.getColFields();
-  Record *MatchInstr = NULL;
+  Record *MatchInstr = nullptr;
 
   for (unsigned i = 0, e = RelatedInstrVec.size(); i < e; i++) {
     bool MatchFound = true;
@@ -378,7 +378,7 @@
     unsigned RelExists = 0;
     if (ColInstrs.size()) {
       for (unsigned j = 0; j < NumCol; j++) {
-        if (ColInstrs[j] != NULL) {
+        if (ColInstrs[j] != nullptr) {
           RelExists = 1;
           OutStr += ", ";
           OutStr += TargetName;