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 globals1;
extern(C) int printf(char*, ...);

char[] gstr = "hello world";

void main()
{
    printf("%.*s\n", gstr.length, gstr.ptr);
    char[] str = gstr;
    printf("%.*s\n", str.length, str.ptr);
}