[libcxx] Remove XFAILs for older macOS versions

That test doesn't fail anymore since r349378, since the assertions that
r349378 removed must have been bugs in the dylib at some point.

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@349484 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/test/std/re/re.traits/translate_nocase.pass.cpp b/test/std/re/re.traits/translate_nocase.pass.cpp
index ae757af..601da6b 100644
--- a/test/std/re/re.traits/translate_nocase.pass.cpp
+++ b/test/std/re/re.traits/translate_nocase.pass.cpp
@@ -16,9 +16,6 @@
 
 // REQUIRES: locale.en_US.UTF-8
 
-// XFAIL: with_system_cxx_lib=macosx10.7
-// XFAIL: with_system_cxx_lib=macosx10.8
-
 #include <regex>
 #include <cassert>