From 8551d25fa909dca97222c56812e19ad37ff1a24b Mon Sep 17 00:00:00 2001
From: "Duncan P. N. Exon Smith" <dexonsmith@apple.com>
Date: Wed, 18 Feb 2015 19:46:02 +0000
Subject: [PATCH] IR: isScopeRef() should check isScope()

r229733 removed an invalid use of `DIScopeRef`, so now we can enforce
that a `DIScopeRef` is actually a scope.

llvm-svn: 229734
---
 llvm/lib/IR/DebugInfo.cpp | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/llvm/lib/IR/DebugInfo.cpp b/llvm/lib/IR/DebugInfo.cpp
index 32521b160a2e..c39c11988a28 100644
--- a/llvm/lib/IR/DebugInfo.cpp
+++ b/llvm/lib/IR/DebugInfo.cpp
@@ -418,7 +418,9 @@ static bool isScopeRef(const Metadata *MD) {
     return true;
   if (auto *S = dyn_cast<MDString>(MD))
     return !S->getString().empty();
-  return isa<MDNode>(MD);
+  if (auto *N = dyn_cast<MDNode>(MD))
+    return DIScope(N).isScope();
+  return false;
 }
 
 /// \brief Check if a field at position Elt of a MDNode can be a ScopeRef.