Sema: Variable templates cannot be static bitfield members

We correctly forbid variables but not variable templates.  Diagnose this
case instead of crashing.

llvm-svn: 224905
diff --git a/clang/lib/Sema/SemaDeclCXX.cpp b/clang/lib/Sema/SemaDeclCXX.cpp
index 5737901..a57a920 100644
--- a/clang/lib/Sema/SemaDeclCXX.cpp
+++ b/clang/lib/Sema/SemaDeclCXX.cpp
@@ -2164,7 +2164,7 @@
     if (BitWidth) {
       if (Member->isInvalidDecl()) {
         // don't emit another diagnostic.
-      } else if (isa<VarDecl>(Member)) {
+      } else if (isa<VarDecl>(Member) || isa<VarTemplateDecl>(Member)) {
         // C++ 9.6p3: A bit-field shall not be a static member.
         // "static member 'A' cannot be a bit-field"
         Diag(Loc, diag::err_static_not_bitfield)