[6.0] Include error type when considering whether a SILFunctionType needs its substitutions. #74527
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Explanation: Fixes a compiler crash when a closure literal with a concrete error type is used in the context of a function that's generic over the closure's error parameter.
Scope: Bug fix.
Issue: rdar://128205122
Original PR: #74525
Risk: Low. A small bug fix that should only affect new code using typed throws.
Testing: Swift CI, test case from bug report
Reviewer: @slavapestov, @rjmccall