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).

extern(C) int printf(char*, ...);

void main()
{
    int[3] a = [1, 2, 3];
    int[3] b = [4, 5, 6];
    int[3] c;

    c[] = a[] + b[];

    printf("c.ptr = %p\n", c.ptr);
    printf("c.length = %lu\n", c.length);

    assert(c[0] == 5);
    assert(c[1] == 7);
    assert(c[2] == 9);
}