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.mem6;

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

int main(){
        int[] index;
        char[] value;

        foreach(int i, char c; "_\U00012345-"){
                printf("str[%d] = %d\n", i , cast(int)c);
                index ~= i;
                //value ~= c;
        }
        printf("done\n");

        return 0;
}