verify that hidden visibility support never goes away


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@33205 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/test/CFrontend/hidden-visibility.c b/test/CFrontend/hidden-visibility.c
new file mode 100644
index 0000000..2bfecac
--- /dev/null
+++ b/test/CFrontend/hidden-visibility.c
@@ -0,0 +1,3 @@
+// RUN: %llvmgcc %s -emit-llvm -S -o - | grep 'hidden global'
+
+int X __attribute__ ((__visibility__ ("hidden"))) = 123;