Support for Thread Safety Analysis in C

Patch by Ethan Jackson.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@187365 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Sema/SemaDeclAttr.cpp b/lib/Sema/SemaDeclAttr.cpp
index d255b29..016c0f1 100644
--- a/lib/Sema/SemaDeclAttr.cpp
+++ b/lib/Sema/SemaDeclAttr.cpp
@@ -597,7 +597,7 @@
     return false;
 
   // FIXME: Lockable structs for C code.
-  if (!isa<CXXRecordDecl>(D)) {
+  if (!isa<RecordDecl>(D)) {
     S.Diag(Attr.getLoc(), diag::warn_thread_attribute_wrong_decl_type)
       << Attr.getName() << ThreadExpectedClassOrStruct;
     return false;