In Microsoft mode, allow template function explicit specialization at class scope.
Necessary to parse MFC and MSVC standard lib code.

Example:
struct X {
  template<class T> void f(T) { }
  template<> void f(int) { } 
}


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@131347 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Sema/SemaTemplate.cpp b/lib/Sema/SemaTemplate.cpp
index c31ed01..9b14f63 100644
--- a/lib/Sema/SemaTemplate.cpp
+++ b/lib/Sema/SemaTemplate.cpp
@@ -4401,9 +4401,12 @@
   }
 
   if (S.CurContext->isRecord() && !IsPartialSpecialization) {
-    S.Diag(Loc, diag::err_template_spec_decl_class_scope)
-      << Specialized;
-    return true;
+    if (S.getLangOptions().Microsoft)
+      S.Diag(Loc, diag::war_template_spec_decl_class_scope) << Specialized;
+    else {    
+      S.Diag(Loc, diag::err_template_spec_decl_class_scope) << Specialized;
+      return true;
+    }
   }
 
   // C++ [temp.class.spec]p6: