Use unsigned long long instead of uin64_t for OS where that matters.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@165147 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/unittests/ADT/StringRefTest.cpp b/unittests/ADT/StringRefTest.cpp
index e9c017b..ead372f 100644
--- a/unittests/ADT/StringRefTest.cpp
+++ b/unittests/ADT/StringRefTest.cpp
@@ -470,7 +470,7 @@
 
 
 TEST(StringRefTest, getAsUnsignedIntegerBadStrings) {
-  uint64_t U64;
+  unsigned long long U64;
   for (size_t i = 0; i < array_lengthof(BadStrings); ++i) {
     bool IsBadNumber = StringRef(BadStrings[i]).getAsInteger(0, U64);
     ASSERT_TRUE(IsBadNumber);