Inspired by r231891, use gender neutral pronouns in the places I've
found in LLVM.

llvm-svn: 231893
diff --git a/llvm/utils/unittest/googletest/include/gtest/gtest.h b/llvm/utils/unittest/googletest/include/gtest/gtest.h
index 07ed92b..257cee6 100644
--- a/llvm/utils/unittest/googletest/include/gtest/gtest.h
+++ b/llvm/utils/unittest/googletest/include/gtest/gtest.h
@@ -74,7 +74,7 @@
 // define it to 0 to indicate otherwise.
 //
 // If the user's ::std::string and ::string are the same class due to
-// aliasing, he should define GTEST_HAS_GLOBAL_STRING to 0.
+// aliasing, they should define GTEST_HAS_GLOBAL_STRING to 0.
 //
 // If the user doesn't define GTEST_HAS_GLOBAL_STRING, it is defined
 // heuristically.