[ASTReader] Add test for previous change r306583 / 145692e.

Summary:
Add a test for the change to ASTReader that reproduces the
logic for consolidating multiple ObjC interface definitions to the
case of multiple ObjC protocol definitions.

This test is a modified copy of the test that accompanied the original
change to interfaces, in 2ba1979.

Reviewers: bruno

Reviewed By: bruno

Subscribers: cfe-commits

Differential Revision: https://reviews.llvm.org/D34788

llvm-svn: 306732
diff --git a/clang/test/Modules/Inputs/lookup-assert-protocol/Base.h b/clang/test/Modules/Inputs/lookup-assert-protocol/Base.h
new file mode 100644
index 0000000..5c9506f
--- /dev/null
+++ b/clang/test/Modules/Inputs/lookup-assert-protocol/Base.h
@@ -0,0 +1,3 @@
+@protocol BaseProtocol
+- (void) test;
+@end