Don't print the entire declaration of the alliassee when `->toChars()` is called on an `AliasDeclaration`; just printing the name will do. This fixes #305, which otherwise tries to generate {{{ class E { void A() { alias /* recurse into E->toCBuffer() */ m; } } }}} by way of an infinite recursion (causing a segfault when the stack runs out).

module bug43;

struct S
{
    ubyte[3] vals;
}

void func(ubyte[3] v)
{
}

void main()
{
    S s;
    func(s.vals);
}