Sema::FinalizeDeclaratorGroup()...make sure we emit an diagnostic for tentative definitions with incomplete types. Touch up all test cases that are effected.

llvm-svn: 46152
diff --git a/clang/test/Sema/array-constraint.c b/clang/test/Sema/array-constraint.c
index df79681..8b2ce5e 100644
--- a/clang/test/Sema/array-constraint.c
+++ b/clang/test/Sema/array-constraint.c
@@ -24,7 +24,8 @@
   return a;
 }
 
-int foo[](void);  // expected-error {{'foo' declared as array of functions}}
+int foo[](void);  // expected-error {{variable has incomplete type 'int (*[])(void)'}} expected-error {{'foo' declared as array of functions}}
+int foo2[1](void);  // expected-error {{'foo2' declared as array of functions}}
 
 typedef int (*pfunc)(void);