Add a new "available_externally" linkage type. This is intended

to support C99 inline, GNU extern inline, etc.  Related bugzilla's
include PR3517, PR3100, & PR2933.  Nothing uses this yet, but it
appears to work.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@68940 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Target/CppBackend/CPPBackend.cpp

@@ -294,6 +294,8 @@ namespace {
       Out << "GlobalValue::InternalLinkage"; break;
     case GlobalValue::PrivateLinkage:
       Out << "GlobalValue::PrivateLinkage"; break;
+    case GlobalValue::AvailableExternallyLinkage:
+      Out << "GlobalValue::AvailableExternallyLinkage "; break;
     case GlobalValue::LinkOnceAnyLinkage:
       Out << "GlobalValue::LinkOnceAnyLinkage "; break;
     case GlobalValue::LinkOnceODRLinkage: