Fix isDiscardableIfUnused to include available_externally linkage.

AvailableExternally functions are discardable.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@247044 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/include/llvm/IR/GlobalValue.h b/include/llvm/IR/GlobalValue.h
index 2961369a732796d0afb6d2c29602b57a1100332a..eb6af507816049c81c603d0868683a704d09c7d5 100644 (file)
--- a/include/llvm/IR/GlobalValue.h
+++ b/include/llvm/IR/GlobalValue.h
@@ -236,7 +236,8 @@ public:
   /// Whether the definition of this global may be discarded if it is not used
   /// in its compilation unit.
   static bool isDiscardableIfUnused(LinkageTypes Linkage) {
-    return isLinkOnceLinkage(Linkage) || isLocalLinkage(Linkage);
+    return isLinkOnceLinkage(Linkage) || isLocalLinkage(Linkage) ||
+           isAvailableExternallyLinkage(Linkage);
   }
 
   /// Whether the definition of this global may be replaced by something