[Sema] Remove assert in TreeTransform<Derived>::TransformObjCObjectType.

The assert isn't correct since TypeLoc::ObjCObjectTypeLoc doesn't
indicate whether the type is a dependent type. The function returns
false for a type like "<SomeProtocol>" which is a synonym for
"id<SomeProtocol>".

rdar://problem/23838912

Differential Revision: http://reviews.llvm.org/D17355

llvm-svn: 261829

clang/lib/Sema/TreeTransform.h

@@ -5932,7 +5932,6 @@ TreeTransform<Derived>::TransformObjCObjectType(TypeLocBuilder &TLB,
   }
 
   ObjCObjectTypeLoc NewT = TLB.push<ObjCObjectTypeLoc>(Result);
-  assert(TL.hasBaseTypeAsWritten() && "Can't be dependent");
   NewT.setHasBaseTypeAsWritten(true);
   NewT.setTypeArgsLAngleLoc(TL.getTypeArgsLAngleLoc());
   for (unsigned i = 0, n = TL.getNumTypeArgs(); i != n; ++i)

clang/test/SemaObjCXX/base-type-as-written.mm

@@ -0,0 +1,9 @@
+// RUN: %clang_cc1 -fsyntax-only -verify %s
+// Make sure we don't crash in TreeTransform<Derived>::TransformObjCObjectType.
+
+@protocol P1
+@end
+
+template <class T1><P1> foo1(T1) { // expected-warning {{protocol has no object type specified; defaults to qualified 'id'}}
+  foo1(0);
+}