[Issue 23722] Lambdas are mangled incorrectly when using multiple compilation units, resulting in incorrect code

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=23722

--- Comment #3 from Dennis <dkorpel at live.nl> ---
> as they are codegen'd into each referencing object file (well, at least with LDC)

Looks like dmd codegen's it in neither object file, I get an undefined
reference error when changing `generateId` to `generateIdWithLoc` for
`FuncExp`.

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