[Issue 22427] betterC: casting an array causes linker error in string comparison.

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=22427

--- Comment #5 from RazvanN <razvan.nitu1305 at gmail.com> ---
It seems that the cast is lowered to __ArrayCast which in turn ends up
instantiating __equals with the same template parameters, but in a speculative
context (static if). Somehow, the template emission strategy decides that the
instance does not require codegen (from what I can tell, the compiler decides
that it's better to put the instance in the imported module - core.memory in
this case), hence the linker errors.

I think that this strategy should be disabled in the case of betterC as it
currently is with -allinst.

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