Commits on Jan 25, 2022

1. s390x: Migrate branches and traps to ISLE …

   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.

   

   uweigand committed Jan 25, 2022
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