[LTO] Fix linking with an alias defined using another alias.

When we're linking an alias which will be defined later, we neeed to
build a GlobalAlias, or else we'll crash later in
IRLinker::linkGlobalValueBody.

clang sometimes constructs aliases like this for C++ destructors.

Differential Revision: https://reviews.llvm.org/D49316

llvm-svn: 337053

1 files changed, 1 insertions, 1 deletions

diff --git a/llvm/lib/Linker/IRMover.cpp b/llvm/lib/Linker/IRMover.cpp
index 0416ddd5601..12f0a1e67c1 100644
--- a/llvm/lib/Linker/IRMover.cpp
+++ b/llvm/lib/Linker/IRMover.cpp
@@ -948,7 +948,7 @@ Expected<Constant *> IRLinker::linkGlobalValueProto(GlobalValue *SGV,
     if (DoneLinkingBodies)
       return nullptr;
 
-    NewGV = copyGlobalValueProto(SGV, ShouldLink);
+    NewGV = copyGlobalValueProto(SGV, ShouldLink || ForAlias);
     if (ShouldLink || !ForAlias)
       forceRenaming(NewGV, SGV->getName());
   }