Add a comment.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@117288 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/Analysis/TypeBasedAliasAnalysis.cpp b/lib/Analysis/TypeBasedAliasAnalysis.cpp
index 65ab70f0b84f9aa0573045dab45838a0b80ecd16..9e8f503e4fd268a60f3939c8c7adccd24a2e93fb 100644 (file)
--- a/lib/Analysis/TypeBasedAliasAnalysis.cpp
+++ b/lib/Analysis/TypeBasedAliasAnalysis.cpp
@@ -31,7 +31,9 @@
 //
 // The second field identifies the type's parent node in the tree, or
 // is null or omitted for a root node. A type is considered to alias
-// all of its decendents and all of its ancestors in the tree.
+// all of its decendents and all of its ancestors in the tree. Also,
+// a type is considered to alias all types in other trees, so that
+// bitcode produced from multiple front-ends is handled conservatively.
 //
 // If the third field is present, it's an integer which if equal to 1
 // indicates that the type is "constant" (meaning pointsToConstantMemory