Optimizer: don't inline named functions in debug builds

[auduchinok]

inline functions are fully inlined on the call sites by F# compiler. This means the source information and actual calls are lost, so it's very hard to reliably debug code using such functions.

This PR prevents inlining inline functions in debug builds. This improves debugging experience by allowing setting breakpoints inside such functions and allowing stepping into them and checking the function arguments. It also allows IDEs to analyze the produced IL more reliably during debug.

The implementation handles two cases. When possible, a normal call to the existing method is emitted. When a function contains SRTPs, a specialized method is created for each type instantiation.

An example inline function that can be called directly:

let inline add a =
    a + 1

[<EntryPoint>]
let main _ =
    let i = add 1
    0

The existing method is called:

An inline function with SRTPs:

let inline add a b =
    a + b

[<EntryPoint>]
let main _ =
    let i = add 1 2
    0

A specialized method is produced and called:

Open questions:

• Should we annotate specialized functions from other assemblies somehow? DebuggerNonUserCode?
• Should we whitelist something from FSharp.Core, like built-in operators?

Implements fsharp/fslang-suggestions#824 for debug builds.
Fixes #9555.

[github-actions]

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