Add a reduced test case for the weak ivar infinite recursion.

llvm-svn: 82747
diff --git a/clang/test/CodeGenObjC/objc2-weak-ivar-debug.m b/clang/test/CodeGenObjC/objc2-weak-ivar-debug.m
new file mode 100644
index 0000000..24a7757
--- /dev/null
+++ b/clang/test/CodeGenObjC/objc2-weak-ivar-debug.m
@@ -0,0 +1,15 @@
+// RUN: clang-cc -triple x86_64-apple-darwin9 -fobjc-gc -g -emit-llvm -o - %s &&
+// RUN: clang-cc -triple i386-apple-darwin9 -fobjc-gc -g -emit-llvm -o - %s
+
+// rdar://7252252
+@interface Loop {
+@public
+  __weak Loop *_loop;
+}
+@end
+
+@implementation Loop @end
+
+void loop(Loop *L) {
+  L->_loop = 0;
+}