Fix warning in .ll parser, detect and reject available_externally on function
declarations.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@68944 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/AsmParser/LLParser.cpp b/lib/AsmParser/LLParser.cpp
index d92957a..af30992 100644
--- a/lib/AsmParser/LLParser.cpp
+++ b/lib/AsmParser/LLParser.cpp
@@ -2131,6 +2131,7 @@
     break;
   case GlobalValue::PrivateLinkage:
   case GlobalValue::InternalLinkage:
+  case GlobalValue::AvailableExternallyLinkage:
   case GlobalValue::LinkOnceAnyLinkage:
   case GlobalValue::LinkOnceODRLinkage:
   case GlobalValue::WeakAnyLinkage: