For PR1136: Rename GlobalVariable::isExternal as isDeclaration to avoid
confusion with external linkage types.

llvm-svn: 33663
diff --git a/llvm/lib/Transforms/Scalar/LowerGC.cpp b/llvm/lib/Transforms/Scalar/LowerGC.cpp
index fa06bd0..a989813 100644
--- a/llvm/lib/Transforms/Scalar/LowerGC.cpp
+++ b/llvm/lib/Transforms/Scalar/LowerGC.cpp
@@ -130,7 +130,7 @@
                                      GlobalValue::LinkOnceLinkage,
                                      Constant::getNullValue(PRLTy),
                                      "llvm_gc_root_chain", &M);
-    } else if (RootChain->hasExternalLinkage() && RootChain->isExternal()) {
+    } else if (RootChain->hasExternalLinkage() && RootChain->isDeclaration()) {
       RootChain->setInitializer(Constant::getNullValue(PRLTy));
       RootChain->setLinkage(GlobalValue::LinkOnceLinkage);
     }