Stabilization report for using the LLD linker on Linux has landed!

The stabilization report for using the LLD linker by default on x64 Linux (x86_64-unknown-linux-gnu) has landed! Hopefully, soon-ish this linker will be used by default, which will make linking (and thus compilation) on x64 Linux much faster by default, especially in incremental scenarios.

This was a very long time in the making.