Scavenging SRTs in scavenge_one

[Ben Gamari]

Hi Simon,

I'm a bit confused by scavenge_one; namely it doesn't scavenge SRTs. It
appears that it is primarily used for remembered set entries but it's
not at all clear why this means that we can safely ignore SRTs (e.g. in
the FUN and THUNK cases).

Can you shed some light on this?

Cheers,

- Ben
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