[Issue 19465] dmd segfaults on endless mixin recursion

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=19465

--- Comment #2 from Dennis <dkorpel at live.nl> ---
Yeah, I don't know if/how this should be "fixed", but notably endless recursion
in CTFE:
`` 
enum a = f();
int f() {return f();}
```
Results in:
Error: function `onlineapp.f` CTFE recursion limit exceeded

While endless recursion in mixin without __traits(compiles, ...):
```
enum string s = "mixin(s);";
mixin(s);
```
Results in, after a while:
Error: out of memory

--