Simplify merging code

Author: teresajohnson

llvm/lib/Analysis/MemoryProfileInfo.cpp

@@ -349,22 +349,18 @@ template <> uint64_t CallStack<MDNode, MDNode::op_iterator>::back() const {
 }
 
 MDNode *MDNode::getMergedMemProfMetadata(MDNode *A, MDNode *B) {
-  if (!(A && B)) {
-    return A ? A : B;
-  }
-
   // TODO: Support more sophisticated merging, such as selecting the one with
   // more bytes allocated, or implement support for carrying multiple allocation
   // leaf contexts. For now, keep the first one.
-  return A;
+  if (A)
+    return A;
+  return B;
 }
 
 MDNode *MDNode::getMergedCallsiteMetadata(MDNode *A, MDNode *B) {
-  if (!(A && B)) {
-    return A ? A : B;
-  }
-
   // TODO: Support more sophisticated merging, which will require support for
   // carrying multiple contexts. For now, keep the first one.
-  return A;
+  if (A)
+    return A;
+  return B;
 }