LoopUnroll comment

Author: atrick

lib/SILOptimizer/LoopTransforms/LoopUnroll.cpp

@@ -33,6 +33,8 @@ using llvm::MapVector;
 namespace {
 
 /// Clone the basic blocks in a loop.
+///
+/// Currently invalidates the DomTree.
 class LoopCloner : public SILCloner<LoopCloner> {
   SILLoop *Loop;