Import MutableArrayRef into clang namespace.

llvm-svn: 211988
diff --git a/clang/lib/Sema/SemaDecl.cpp b/clang/lib/Sema/SemaDecl.cpp
index 073da57..ef2035c 100644
--- a/clang/lib/Sema/SemaDecl.cpp
+++ b/clang/lib/Sema/SemaDecl.cpp
@@ -9277,7 +9277,7 @@
 /// BuildDeclaratorGroup - convert a list of declarations into a declaration
 /// group, performing any necessary semantic checking.
 Sema::DeclGroupPtrTy
-Sema::BuildDeclaratorGroup(llvm::MutableArrayRef<Decl *> Group,
+Sema::BuildDeclaratorGroup(MutableArrayRef<Decl *> Group,
                            bool TypeMayContainAuto) {
   // C++0x [dcl.spec.auto]p7:
   //   If the type deduced for the template parameter U is not the same in each