Adding a test case for revision 132825.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@132830 91177308-0d34-0410-b5e6-96231b3b80d8

test/CodeGen/X86/visibility2.ll

@@ -0,0 +1,18 @@
+; This test case ensures that when the visibility of a global declaration is 
+; emitted they are not treated as definitions.  Test case for r132825.
+; Fixes <rdar://problem/9429892>.
+;
+; RUN: llc -mtriple=x86_64-apple-darwin %s -o - | FileCheck %s
+
+@foo_private_extern_str = external hidden global i8*
+
+define void @foo1() nounwind ssp {
+entry:
+  %tmp = load i8** @foo_private_extern_str, align 8
+  call void @foo3(i8* %tmp)
+  ret void
+}
+
+declare void @foo3(i8*)
+
+; CHECK-NOT: .private_extern