Use %llu to print a 64 bit number. Should fix the ARM bots.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@186113 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/tools/llvm-ar/llvm-ar.cpp b/tools/llvm-ar/llvm-ar.cpp
index 2aab2cb..fd6841c 100644
--- a/tools/llvm-ar/llvm-ar.cpp
+++ b/tools/llvm-ar/llvm-ar.cpp
@@ -330,7 +330,7 @@
         printMode(mode & 007);
         outs() << ' ' << I->getUser();
         outs() << "/" << I->getGroup();
-        outs() << ' ' << format("%6u", I->getSize());
+        outs() << ' ' << format("%6llu", I->getSize());
         sys::TimeValue ModTime = I->getModTime();
         outs() << " " << ModTime.str();
         outs() << " " << I->getPath().str() << "\n";