Looking for a recent error reporting change

[Chris Smith]

Hi.  In GHC 8.6.5, if I compile a main module that both fails to define
`main` and also contains other errors, the other errors are not reported
because GHC aborts after realizing that there is no `main`.  In GHC 8.10.1,
all errors are reported.  I'm looking for where this change was made, in
the hopes that it's easy to backport to a local branch of GHC 8.6.5.  Does
anyone know off-hand?
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