Change the name of ArrayBoundsException in druntime

[Robert Fraser]

Sean Kelly wrote:
> Perhaps I'm simply getting old... when did memory use become irrelevant? 
>  I grant that making an application exception safe is more difficult if 
> out of memory conditions are considered recoverable, but I don't think 
> it's tremendously more difficult.

I'm currently studying Computer Engineering at university. I don't think 
a single programming course I've taken has _mentioned_ running out of 
memory (next quarter I'm taking Operating Systems, so hopefully that 
will). One class mentioned memory complexity as a side issue, but never 
got into it. Even at work, I've never been asked to think about it.