Auto merge of #51411 - nnethercote:process_predicate, r=nikomatsakis
Speed up obligation forest code Here are the rustc-perf benchmarks that get at least a 1% speedup on one or more of their runs with these patches applied: ``` inflate-check avg: -8.7% min: -12.1% max: 0.0% inflate avg: -5.9% min: -8.6% max: 1.1% inflate-opt avg: -1.5% min: -2.0% max: -0.3% clap-rs-check avg: -0.6% min: -1.9% max: 0.5% coercions avg: -0.2%? min: -1.3%? max: 0.6%? serde-opt avg: -0.6% min: -1.0% max: 0.1% coercions-check avg: -0.4%? min: -1.0%? max: -0.0%? ```
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