Module ClangFrontend.CAddImplicitDeallocImpl

This models ARC implementation of dealloc, see https://clang.llvm.org/docs/AutomaticReferenceCounting.html#dealloc. Dealloc methods can be added to ObjC classes to free C memory for example, but the deallocation of the ObjC instance variables of the object is done automatically. So here we add this explicitely to Infer: we add calls to dealloc of the ObjC instance variables. Here we assume that every ObjC class has already a dealloc method, because if it doesn't exist we add an empty method in CFrontend_decl.create_and_process_dealloc_objc_impl TODO(T68411500): add calls to dealloc of the superclass.