Fix namespace polution.

llvm-svn: 109440
diff --git a/clang/lib/Sema/SemaDecl.cpp b/clang/lib/Sema/SemaDecl.cpp
index 11e1ffe..1788eb7 100644
--- a/clang/lib/Sema/SemaDecl.cpp
+++ b/clang/lib/Sema/SemaDecl.cpp
@@ -929,6 +929,8 @@
   }
 }
 
+namespace {
+
 /// Used in MergeFunctionDecl to keep track of function parameters in
 /// C.
 struct GNUCompatibleParamWarning {
@@ -937,6 +939,7 @@
   QualType PromotedType;
 };
 
+}
 
 /// getSpecialMember - get the special member enum for a method.
 Sema::CXXSpecialMember Sema::getSpecialMember(const CXXMethodDecl *MD) {