Modify comments.
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@55150 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Analysis/Environment.cpp b/lib/Analysis/Environment.cpp
index 570a38f..15a1d36 100644
--- a/lib/Analysis/Environment.cpp
+++ b/lib/Analysis/Environment.cpp
@@ -139,8 +139,9 @@
// The block expr is dead.
RVal X = I.getData();
- // Do not misclean LogicalExpr or ConditionalOperator.
- // Why is it dead? Should look at LiveVariables.
+ // Do not misclean LogicalExpr or ConditionalOperator. It is dead at the
+ // beginning of itself, but we need its UndefinedVal to determine its
+ // RVal.
if (X.isUndef() && cast<UndefinedVal>(X).getData())
continue;