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).

private import tango.core.Thread;

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

void foo()
{
		printf("-- I am here\n");
		Fiber.yield();
		printf("-- Now I am here\n");
}

void main()
{
	Fiber f = new Fiber(&foo);

	printf("Running f once\n");
	f.call();
	printf("Running f again\n");
	f.call();
}