Optimizer: fix accessing captured values when skipping inlining

[auduchinok]

Fixes the captured values repro from #20063.

let f () =
    let x = 42
    let inline g y = x + int y
    g 1uy

printfn "%A (expected 43)" (f ())

let f2 () =
    let xs = [ 1; 2; 3 ]
    let inline g y = xs |> List.map (fun v -> v + int y) |> List.sum
    g 1uy

printfn "%A (expected 9)" (f2 ())

[T-Gro]

The actual source code triggered from test starts with a leading newline, so the index 3 here actually points to the 2nd line in this .bsl file header. Took me a while to mentally navigate from the indexes to code with this deviation.

[github-actions]

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cc @dotnet/fsharp-team-msft

[auduchinok]

This is ready.

[github-actions]

🔍 Tooling Safety Check — Affects-Compiler-Output
Affects-Compiler-Output: modifies Optimizer.fs (IL output)

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