fix a crash that could occur when a variable declaration became a
function definition.

llvm-svn: 67446
diff --git a/clang/test/CodeGen/mangle.c b/clang/test/CodeGen/mangle.c
index bcb1400..89e0e8a 100644
--- a/clang/test/CodeGen/mangle.c
+++ b/clang/test/CodeGen/mangle.c
@@ -36,3 +36,14 @@
 }
 int foo4 __asm__("var") = 4;
 
+
+// Variable becomes a function
+extern int foo5 __asm__("var2");
+
+void test3() {
+  foo5 = 1;
+}
+
+void foo6() __asm__("var2");
+void foo6() {
+}