Add `FIXME` for faster cached block transfer functions

I've tried a few ways of implementing this, but each fell short.

Adding an auxiliary `_Idx` associated type to `Analysis` that defaults
to `!` but is overridden in the blanket impl of `Analysis` for `A:
GenKillAnalysis` to `A::Idx` seems promising, but the trait solver is
unable to prove equivalence between `A::Idx` and `A::_Idx` within the
overridden version of `into_engine`. Without full-featured
specialization, removing `into_engine` or splitting it into a different
trait would have a significant ergonomic penalty.

Alternatively, we could erase the index type and store a
`GenKillSet<u32>` as well as a function pointer for transmuting between
`&mut A::Domain` and `&mut BitSet<u32>` in the hopes that LLVM can
devirtualize a simple function pointer better than the boxed closure.
However, this is brittle, requires `unsafe` code, and doesn't work for
index types that aren't the same size as a `u32` (e.g. `usize`) since
`GenKillSet` stores a `HybridBitSet`, which may be a `Vec<I>`. Perhaps
safe transmute could help here?

compiler/rustc_mir/src/dataflow/framework/engine.rs

@@ -87,6 +87,11 @@ where
     analysis: A,
 
     /// Cached, cumulative transfer functions for each block.
+    //
+    // FIXME(ecstaticmorse): This boxed `Fn` trait object is invoked inside a tight loop for
+    // gen/kill problems on cyclic CFGs. This is not ideal, but it doesn't seem to degrade
+    // performance in practice. I've tried a few ways to avoid this, but they have downsides. See
+    // the message for the commit that added this FIXME for more information.
     apply_trans_for_block: Option<Box<dyn Fn(BasicBlock, &mut A::Domain)>>,
 }