Auto merge of #142471 - lqd:sparse-borrows, r=nnethercote

use `MixedBitSet` for borrows-in-scope dataflow analysis

The `Borrows` dataflow analysis uses a dense bitset, but a bitset supporting _some_ amount of sparseness is better suited for big functions with a big number of loans.

The cutoff between dense and chunked bitset is around 2K loans IIRC, and we could finesse that value if we wanted to, but as-is it happens to a couple of rustc-perf benchmarks (which IIRC are at least partially generated from macros and the likes.). It's a small win on these two, and shouldn't have any impact on the others.

r? `@matthewjasper`

Author: bors