[Issue 21893] core.atomic calls itself recursively

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=21893

--- Comment #1 from Richard Cattermole <alphaglosined at gmail.com> ---
cas also appears to suffer from this issue:

https://github.com/dlang/druntime/blob/master/src/core/atomic.d#L386

return atomicCompareExchangeStrongNoResult!(succ, fail)(cast(T*)here,
*cast(Thunk1*)&ifThis, *cast(Thunk2*)&writeThis);

Since this was asked by Herringway on IRC, this was patched live and after
patching it no longer appears to call itself recursively.

I don't know how valid these proposed fixes are, only it seems to resolve it
for my use case (Struct*[2]).

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