[analyzer][cfe] Add TypeAnalyzerOperations.matchInferableParameter This CL abstracts the notion of a type parameter that the compiler should infer for. Since the notion of such a parameter is used throughout the constraint generation, it is represented as another type variable in the shared interfaces, similarly to Type, TypeSchema, and other similar abstractions. The affected regions of constraint generation are the central points of that algorithm and don't require additional tests since any test that requires non-trivial type inference exercises a pass through those points. Part of https://github.com/dart-lang/sdk/issues/54902 Change-Id: Idc7fe13952c40e748e761cc90ab74e7ccf45ee50 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/357611 Reviewed-by: Johnni Winther <johnniwinther@google.com> Reviewed-by: Paul Berry <paulberry@google.com>
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