reimplement the recursive impls of findfirst, findlast
#54480
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Better type inference example:
```julia-repl
julia> Core.Compiler.return_type(Base._findlast_rec, Tuple{typeof(_ -> rand(Bool)),Tuple})
Union{Nothing, Int64}
```
Example of better effects:
```julia-repl
julia> Base.infer_effects(Base._findlast_rec, Tuple{typeof(Returns(true)),Tuple{Vararg{Any,50}}})
(+c,+e,+n,+t,+s,?m,+u)
julia> Base.infer_effects(Base._findlast_rec, Tuple{typeof(Returns(false)),Tuple{Vararg{Any,50}}})
(+c,+e,+n,+t,+s,?m,+u)
```
FTR, this PR is part of a series of changes which (re)implement many of
the operations on tuples using a new recursive technique. The ultimate
goal is to hopefully increase the value of the loop-vs-recurse cutoff
(`Any32`, sometimes hardcoded `32`) for tuple operations.
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Better type inference example:
Example of better effects:
FTR, this PR is part of a series of changes which (re)implement many of the operations on tuples using a new recursive technique. The ultimate goal is to hopefully increase the value of the loop-vs-recurse cutoff (
Any32, sometimes hardcoded32) for tuple operations.