[pull] master from ruby:master #437
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I made a special kind of `ProfiledType` that looks at specific objects, not just their classes/shapes (#15051). Then I profiled some of our benchmarks. For lobsters: ``` Top-6 invokeblock handler (100.0% of total 1,064,155): megamorphic: 494,931 (46.5%) monomorphic_iseq: 337,171 (31.7%) polymorphic: 113,381 (10.7%) monomorphic_ifunc: 52,260 ( 4.9%) monomorphic_other: 38,970 ( 3.7%) no_profiles: 27,442 ( 2.6%) ``` For railsbench: ``` Top-6 invokeblock handler (100.0% of total 2,529,104): monomorphic_iseq: 834,452 (33.0%) megamorphic: 818,347 (32.4%) polymorphic: 632,273 (25.0%) monomorphic_ifunc: 224,243 ( 8.9%) monomorphic_other: 19,595 ( 0.8%) no_profiles: 194 ( 0.0%) ``` For shipit: ``` Top-6 invokeblock handler (100.0% of total 2,104,148): megamorphic: 1,269,889 (60.4%) polymorphic: 411,475 (19.6%) no_profiles: 173,367 ( 8.2%) monomorphic_other: 118,619 ( 5.6%) monomorphic_iseq: 84,891 ( 4.0%) monomorphic_ifunc: 45,907 ( 2.2%) ``` Seems like a monomorphic case for a specific ISEQ actually isn't a bad way of going about this, at least to start...
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