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This patch recognizes that we only need to perform one scan for the 835769 errata and that this scan can take place before we insert branch stubs. The erratum scan code is relocated and adjusted to create stub entries directly rather than populating an intermediate representation. Since stub entries are created immediately we can drop the adhoc stub size adjustment code and allow the generic stub sizing code to deal with 835769 stub entries. This patch restructures the code but does not change the workaround used to deal with erratum 83679, the exact placement of workaround stubs in the final image may change slightly after this patch due to stubs being created in a different order.
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