Help GCC along with code that's actually unreachable.

Unfortunately I don't think there's a fix for this that will work upstream and
also satisfy Clang's -Wunreachable-code, which is a pity. But I'll give it some
more thought -perhaps there's some way out.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@148645 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/utils/unittest/googletest/gtest.cc b/utils/unittest/googletest/gtest.cc
index 6538924..3fdff0a 100644
--- a/utils/unittest/googletest/gtest.cc
+++ b/utils/unittest/googletest/gtest.cc
@@ -2481,6 +2481,9 @@
       return "Failure\n";
 #endif
   }
+
+  // All cases return, so this is unreachable but GCC doesn't know it
+  abort();
 }
 
 // Prints a TestPartResult to a String.