coverage: Move unused-function synthesis into its own submodule #115505
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One of the tasks performed by coverage instrumentation is to synthesize stubs for unused functions, so that they can have coverage mappings associated with them and be processed normally by the LLVM coverage reporting tools.
This code is somewhat complex, and can be cleanly separated from what the other modules are doing, so this PR moves it into its own
unused
submodule.This is purely moving existing code around, so there should be no behavioural changes.