Turn anonymous type in anonymous union warning back on after cleaning up
issues.

llvm-svn: 177136
diff --git a/llvm/autoconf/configure.ac b/llvm/autoconf/configure.ac
index b8f1766..9d61c24 100644
--- a/llvm/autoconf/configure.ac
+++ b/llvm/autoconf/configure.ac
@@ -1270,7 +1270,6 @@
 AC_MSG_CHECKING([optional compiler flags])
 CXX_FLAG_CHECK(NO_VARIADIC_MACROS, [-Wno-variadic-macros])
 CXX_FLAG_CHECK(NO_MISSING_FIELD_INITIALIZERS, [-Wno-missing-field-initializers])
-CXX_FLAG_CHECK(NO_NESTED_ANON_TYPES, [-Wno-nested-anon-types])
 CXX_FLAG_CHECK(COVERED_SWITCH_DEFAULT, [-Wcovered-switch-default])
 
 dnl GCC's potential uninitialized use analysis is weak and presents lots of
@@ -1288,7 +1287,7 @@
     CXX_FLAG_CHECK(NO_UNINITIALIZED, [-Wno-uninitialized])
   fi
 fi
-AC_MSG_RESULT([$NO_VARIADIC_MACROS $NO_MISSING_FIELD_INITIALIZERS $NO_NESTED_ANON_TYPES $COVERED_SWITCH_DEFAULT $NO_UNINITIALIZED $NO_MAYBE_UNINITIALIZED])
+AC_MSG_RESULT([$NO_VARIADIC_MACROS $NO_MISSING_FIELD_INITIALIZERS $COVERED_SWITCH_DEFAULT $NO_UNINITIALIZED $NO_MAYBE_UNINITIALIZED])
 
 AC_ARG_WITH([python],
             [AS_HELP_STRING([--with-python], [path to python])],