[dmd-internals] Next round of ICE and wrong-code patches

[Walter Bright]

Thanks, Don. I have a whole backlog of stuff to merge in as well.

Don Clugston wrote:
> These patches have built up while waiting for the 2.051 to be cleared
> for release.
>
> //Trivial:
> 5242 self referencing template constraint crashes compiler
>
> // These two are back-end optimizer bugs, though they are only
> incorrect asserts. I think the second one is quite interesting, it
> shows the optimiser has
> // an O(n^^2) performance for comma expressions. If you ever find the
> optimiser is slow, I think there's an excellent chance that that is
> the reason.
> 4379 ICE(blockopt.c): foreach over huge tuple, only with -O
> 3681 ICE(go.c): when function takes too long to optimize, only with -O.
>
> 5025 ICE(cast.c) shared struct literal
> 5090 ICE(todt.c) struct literal initializing zero length array
> 4389 ICE(constfold.c, expression.c), or wrong code: string~=dchar in CTFE
>  ---> this one is fairly large, I can commit it if you prefer
>
> // mitigation only.
> 4860 Taking delegates to a member function broken if method is also
> aliased in from a base class
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