Upgrade reference compiler to 3.0.1-RC2#12913

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smarter wants to merge 2 commits intoscala:masterfrom

dotty-staging:ref-3.0.1-RC2

Commits on Jun 23, 2021

Upgrade reference compiler to 3.0.1-RC2
smarter
committed

Commits on Jun 29, 2021

Upgrade reference compiler to the latest nightly
smarter
committed