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In order to migrate branches to ISLE, we define a second entry point `lower_branch` which gets the list of branch targets as additional argument. This requires a small change to `lower_common`: the `isle_lower` callback argument is changed from a function pointer to a closure. This allows passing the extra argument via a closure. Traps make use of the recently added facility to emit safepoints from ISLE, but are otherwise straightforward.
This crate contains the core Cranelift code generator. It translates code from an intermediate representation into executable machine code.