[Issue 18656] Compile DUB with LDC

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=18656

--- Comment #3 from Seb <greensunny12 at gmail.com> ---
> Do you use phobos compiled for LTO too?

Not for this quick benchmark - the main point of this issue was just to point
out that we should be using LDC for building the DUB binaries due to smaller
size + better performance (though to be fair I don't have good numbers for this
and it's partially backed up by prior DMD vs. LDC benchmarks).

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