Revert my available_externally vtables experiment. It's breaking the LLVM-with-Clang build with linker errors that I have yet to investigate.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@92822 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/test/CodeGenCXX/vtable-linkage.cpp b/test/CodeGenCXX/vtable-linkage.cpp
index 5738007..eaefdfa 100644
--- a/test/CodeGenCXX/vtable-linkage.cpp
+++ b/test/CodeGenCXX/vtable-linkage.cpp
@@ -125,7 +125,7 @@
 
 // F<int> is an explicit template instantiation declaration without a
 // key function, so its vtable should have weak_odr linkage.
-// CHECK: @_ZTV1FIiE = available_externally constant
+// CHECK: @_ZTV1FIiE = weak_odr constant
 
 // E<int> is an explicit template instantiation declaration. It has a
 // key function that is not instantiation, so we should only reference