[analyzer]Recognize ivar invalidation protocol even if it was redeclared

This will get rid of some false positives as well as false negatives.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@172169 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/test/Analysis/objc_invalidation.m b/test/Analysis/objc_invalidation.m
index 15bcabe..84028dd 100644
--- a/test/Analysis/objc_invalidation.m
+++ b/test/Analysis/objc_invalidation.m
@@ -35,6 +35,9 @@
 - (void) invalidate2 __attribute__((annotate("objc_instance_variable_invalidator")));
 @end
 
+@protocol Invalidation3;
+@protocol Invalidation2;
+
 @interface Invalidation2Class <Invalidation2>
 @end