Unbreak the build. Fallout from r170019.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@170033 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/unittests/Support/YAMLIOTest.cpp b/unittests/Support/YAMLIOTest.cpp
index c24114a..5c9db01 100644
--- a/unittests/Support/YAMLIOTest.cpp
+++ b/unittests/Support/YAMLIOTest.cpp
@@ -552,7 +552,7 @@
     }
 
     static StringRef input(StringRef scalar, void *, MyNumber &value) {
-      int64_t n;
+      long long n;
       if ( getAsSignedInteger(scalar, 0, n) )
         return "invalid number";
       value = n;