Commits on Feb 19, 2024

1. Make intrinsic fallback bodies cross-crate inlineable …

   This change was prompted by the stage1 compiler spending 4% of its time
   when compiling the polymorphic-recursion MIR opt test in `unlikely`.
   
   Intrinsic fallback bodies like `unlikely` should always be inlined, it's
   very silly if they are not. To do this, we enable the fallback bodies to
   be cross-crate inlineable. Not that this matters for our workloads since
   the compiler never actually _uses_ the "fallback bodies", it just uses
   whatever was cfg(bootstrap)ped, so I've also added `#[inline]` to those.

   

   Noratrieb committed Feb 19, 2024
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