Vendor import of llvm release_30 branch r142614:

http://llvm.org/svn/llvm-project/llvm/branches/release_30@142614

1 files changed, 5 insertions, 1 deletions

diff --git a/include/llvm/ADT/PointerUnion.h b/include/llvm/ADT/PointerUnion.h
index 13b98ce..487096a 100644
--- a/include/llvm/ADT/PointerUnion.h
+++ b/include/llvm/ADT/PointerUnion.h
@@ -108,7 +108,11 @@ namespace llvm {
     
     /// isNull - Return true if the pointer held in the union is null,
     /// regardless of which type it is.
-    bool isNull() const { return Val.getPointer() == 0; }
+    bool isNull() const {
+      // Convert from the void* to one of the pointer types, to make sure that
+      // we recursively strip off low bits if we have a nested PointerUnion.
+      return !PointerLikeTypeTraits<PT1>::getFromVoidPointer(Val.getPointer());
+    }
     operator bool() const { return !isNull(); }
 
     /// is<T>() return true if the Union currently holds the type matching T.