JuliaLang / julia / #37513

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Fix inference of one-arg `return_type` method (#49407)

* Fix inference of one-arg `return_type` method

`Core.Compiler.return_type` has two methods:
 - return_type(f, args::Type{<:Tuple})
 - return_type(args::Type{<:Tuple})

Our inference code was only catching the first one.
Expand it to support both.

* Update test/compiler/inference.jl

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Co-authored-by: Shuhei Kadowaki <40514306+aviatesk@users.noreply.github.com>

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