Simplify logic by using the appropriate functions.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@182869 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/IR/DebugInfo.cpp b/lib/IR/DebugInfo.cpp
index 6a014ae..6843581 100644
--- a/lib/IR/DebugInfo.cpp
+++ b/lib/IR/DebugInfo.cpp
@@ -351,9 +351,8 @@
 
 DIType::DIType(const MDNode *N) : DIScope(N) {
   if (!N) return;
-  if (!isBasicType() && !isDerivedType() && !isCompositeType()) {
+  if (!isType())
     DbgNode = 0;
-  }
 }
 
 unsigned DIArray::getNumElements() const {