Fix a typo 'iff' => 'if'

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@164767 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/utils/unittest/googletest/gtest-death-test.cc b/utils/unittest/googletest/gtest-death-test.cc
index bf7e32c..3641ca5 100644
--- a/utils/unittest/googletest/gtest-death-test.cc
+++ b/utils/unittest/googletest/gtest-death-test.cc
@@ -484,7 +484,7 @@
 //   status_ok: true if exit_status is acceptable in the context of
 //              this particular death test, which fails if it is false
 //
-// Returns true iff all of the above conditions are met.  Otherwise, the
+// Returns true if all of the above conditions are met.  Otherwise, the
 // first failing condition, in the order given above, is the one that is
 // reported. Also sets the last death test message string.
 bool DeathTestImpl::Passed(bool status_ok) {