Remove llvm:: from uses of ArrayRef.

llvm-svn: 211987
diff --git a/clang/lib/Serialization/ASTWriter.cpp b/clang/lib/Serialization/ASTWriter.cpp
index 855991d..a02a959 100644
--- a/clang/lib/Serialization/ASTWriter.cpp
+++ b/clang/lib/Serialization/ASTWriter.cpp
@@ -3163,7 +3163,7 @@
   }
 
   static void emitMacroOverrides(raw_ostream &Out,
-                                 llvm::ArrayRef<SubmoduleID> Overridden) {
+                                 ArrayRef<SubmoduleID> Overridden) {
     if (!Overridden.empty()) {
       using namespace llvm::support;
       endian::Writer<little> LE(Out);