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 tangotests.marray2;

void main()
{
    int[][] ma = new int[][](2,4);
    assert(ma.length == 2);
    assert(ma[0].length == 4);
    assert(ma[1].length == 4);
    ma[0][3] = 32;
    ma[1][2] = 123;
    ma[0][0] = 55;
    assert(ma[0][3] == 32);
    assert(ma[1][2] == 123);
    assert(ma[0][0] == 55);
}