WIP: Add ABIOverwrite type for owner field #56555
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Together with #54899, this PR is intending to replicate the functionality of #54373, which allowed particular specializations to have a different ABI signature than what would be suggested by the MethodInstance's `specTypes` field. This PR handles that by adding a special `ABIOverwrite` type, which, when placed in the `owner` field of a `CodeInstance` instructs the system to use the given signature instead.
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Together with #54899, this PR is intending to replicate the functionality of #54373, which allowed particular specializations to have a different ABI signature than what would be suggested by the MethodInstance's
specTypesfield. This PR handles that by adding a specialABIOverwritetype, which, when placed in theownerfield of aCodeInstanceinstructs the system to use the given signature instead.