Cache wrapped ABI pointer in InterfaceWrapperBase

[mliberman]

Cache internal ABI pointer in InterfaceWrapperBase

InterfaceWrapperBase.toABI was doing an as? AnyAbiInterfaceImpl<I> dynamic cast on every call, which triggers swift_dynamicCast → swift_conformsToProtocol in the Swift runtime. This caches the result at init time in a wrappedAbi property so toABI becomes a simple nil check.

Benchmark results (vs lazy-error-fix baseline, 7 runs)

Benchmark	Baseline (ns)	Optimized (ns)	Change	Speedup	p-value
Object
object.in	3,998	2,560	-36.0%	1.56x	*** p<0.001
Collection
collection.vector_in	4,400	2,969	-32.5%	1.48x	*** p<0.001
collection.map_out	3,542	3,355	-5.3%	1.06x	*** p<0.001
Weak Reference
weakref.create_resolve	17,506	14,543	-16.9%	1.20x	*** p<0.001
weakref.create	6,588	5,207	-21.0%	1.26x	*** p<0.001
weakref.resolve	10,519	9,022	-14.2%	1.17x	** p<0.01
Integration
integration	68,559	62,689	-8.6%	1.09x	*** p<0.001

[mliberman]

• Cache wrapped ABI pointer in InterfaceWrapperBase #249 👈 (View in Graphite)
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