Unbreak unit tests.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@79879 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/unittests/ADT/APIntTest.cpp b/unittests/ADT/APIntTest.cpp
index a89a960..3fd4fd4 100644
--- a/unittests/ADT/APIntTest.cpp
+++ b/unittests/ADT/APIntTest.cpp
@@ -17,6 +17,13 @@
 
 namespace {
 
+// Support APInt output to an std::ostream.
+inline std::ostream &operator<<(std::ostream &OS, const APInt &Value) {
+  raw_os_ostream RawOS(OS);
+  RawOS << Value;
+  return OS;
+}
+
 // Test that APInt shift left works when bitwidth > 64 and shiftamt == 0
 TEST(APIntTest, ShiftLeftByZero) {
   APInt One = APInt::getNullValue(65) + 1;