Testcase for 6522054.

llvm-svn: 63067

llvm/test/FrontendObjC/2009-01-26-WriteBarrier-2.m

@@ -0,0 +1,14 @@
+// RUN: %llvmgcc -x objective-c -S %s -fobjc-gc -o - | grep objc_assign_strongCast
+// rdar://5541393
+
+typedef struct {
+    void (^ivarBlock)(void);
+} StructWithBlock_t;
+
+int main(char *argc, char *argv[]) {
+   StructWithBlock_t *swbp = (StructWithBlock_t *)malloc(sizeof(StructWithBlock_t*));
+   __block   int i = 10;
+   // assigning a Block into an struct slot should elicit a write-barrier under GC
+   swbp->ivarBlock = ^ { ++i; }; 
+   return 0;
+}