Index: llvm/lib/CodeGen/MIRFSDiscriminator.cpp
===================================================================
--- llvm/lib/CodeGen/MIRFSDiscriminator.cpp
+++ llvm/lib/CodeGen/MIRFSDiscriminator.cpp
@@ -132,8 +132,9 @@
     if (!M->getGlobalVariable(FSDiscriminatorVar)) {
       auto &Context = M->getContext();
       // Create a global variable to flag that FSDiscriminators are used.
+      // Using "common" linkage so that it will not gc GC'ed.
       new GlobalVariable(*M, Type::getInt1Ty(Context), true,
-                         GlobalValue::WeakAnyLinkage,
+                         GlobalValue::CommonLinkage,
                          ConstantInt::getTrue(Context), FSDiscriminatorVar);
     }