Init LookupResult::AmbiguityKind

We don't expect useful value there unless it's "ambiguous".
However we use read it for copying and moving, so we need either init the field
add login to avoid reading invalid values. Such reads trigger ubsan errors.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@343150 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 3 insertions, 1 deletions

diff --git a/include/clang/Sema/Lookup.h b/include/clang/Sema/Lookup.h
index faf2343d39..ef2842195f 100644
--- a/include/clang/Sema/Lookup.h
+++ b/include/clang/Sema/Lookup.h
@@ -709,7 +709,9 @@ private:
 
   // Results.
   LookupResultKind ResultKind = NotFound;
-  AmbiguityKind Ambiguity; // ill-defined unless ambiguous
+  // ill-defined unless ambiguous. Still need to be initialized it will be
+  // copied/moved.
+  AmbiguityKind Ambiguity = {}; 
   UnresolvedSet<8> Decls;
   CXXBasePaths *Paths = nullptr;
   CXXRecordDecl *NamingClass = nullptr;