Commits on Apr 4, 2024

1. cranelift/x64: Rely on zero-extended constants …

   Since bytecodealliance#6850, we've been able to rely on `iconst` instructions having
   their immediate operands' high bits zeroed before lowering.
   
   So a couple of places in `x64/lower.rs` can be expressed more simply now
   as a result.
   
   Out of an abundance of caution, I added a debug-assertion when constants
   are looked up during lowering, to check that earlier phases really did
   ensure the high bits are zero.
   
   I also got rid of an `expect` where a simple pattern-match will do.

   

   jameysharp committed Apr 4, 2024
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