embedded: change the function representation of directly called witness methods#85707

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eeckstein wants to merge 6 commits intoswiftlang:mainfrom

eeckstein:embedded-witness-method-specialization

Commits on Nov 26, 2025

AST: add `enum FunctionTypeRepresentation` and `TypeProperties.functionTypeRepresentation`
eeckstein
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FunctionPassContext: support setting arbitrary function type representations when creating specialized functions
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Mangling: add a specialization mangling for changing the function type representation of a function
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Optimizer: add `FunctionPassContext.mangle(withChangedRepresentation original: Function)`
eeckstein
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Optimizer: extract replacing an apply into a utility function `ApplySite.replace(withCallTo:)`
eeckstein
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embedded: change the function representation of directly called witness methods
eeckstein
committed