objc-arc: fix a IRGen crash when checking for

accessibility of an initializer which is a compound 
statement. // rdar://9694706


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@134091 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 2 insertions, 1 deletions

diff --git a/lib/CodeGen/CGDecl.cpp b/lib/CodeGen/CGDecl.cpp
index 68b1d3be66..d508ff7390 100644
--- a/lib/CodeGen/CGDecl.cpp
+++ b/lib/CodeGen/CGDecl.cpp
@@ -454,7 +454,8 @@ static bool isAccessedBy(const VarDecl &var, const Stmt *s) {
   }
 
   for (Stmt::const_child_range children = s->children(); children; ++children)
-    if (isAccessedBy(var, *children))
+    // children might be null; as in missing decl or conditional of an if-stmt.
+    if ((*children) && isAccessedBy(var, *children))
       return true;
 
   return false;