Currently ObjCStubsSection is handling both the logic for the
"__objc_stubs" section, as well as the logic for the "__objc_selrefs"
section.
While this is OK for now, it will be an issue for other features that
want to interact with the "__objc_selrefs" section, such as upcoming
relative method lists feature - which will also want to create /
reference entries in the "__objc_selrefs" section.
In this PR we split the logic relating to handling the "__objc_selrefs"
section into a new SyntheticSection (ObjCSelRefsSection). Non-functional
change - neither the behavior nor implementation changes, the interface
is just made more friendly to not have "__objc_selrefs" so bound to
"__objc_stubs".
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Co-authored-by: Alex B <alexborcan@meta.com>
a53401e9df