[release/8.0] Fix type parameter mapping logic in ILLink/ILCompiler #92139
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Backport of #92088 to release/8.0
/cc @sbomer
Customer Impact
Fixes a blocking bug that was causing ILLink to crash. The crash can be observed when using code or dependencies with a certain kind of lambda expression usage. Originally reported in #91880, where it was observed in an empty blazor app with a reference to
LanguageExt.Core.Testing
Added test coverage for this pattern, and verified that the original repro is fixed.
Risk
Low risk. This only introduces another case to the existing discovery logic.