[Issue 19160] wrong C++ mangle for const template args

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=19160

--- Comment #2 from Илья Ярошенко <ilyayaroshenko at gmail.com> ---
(In reply to Nicholas Wilson from comment #1)
> What DMDFE version are you using? I'm pretty sure I fixed this in
> https://github.com/dlang/dmd/pull/8432

LDC beta with DMDFE 2.081.1

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