[clr-ios] Add options to strip inlining and debug info in Crossgen2 on Apple mobile

[kotlarmilos]

Description

This PR adds --strip-inlining-info and --strip-debug-info options to crossgen2 and auto-enables them for Apple mobile platforms. Stripping these sections reduces the composite R2R dylib size by 2.2 MB in MAUI template app.

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[rolfbjarne]

Is this managed or native debug info? i.e. does this affect native stack traces / crash reports in any way?

[jkotas]

It is managed debug info. It does not affect what you see in the native debugger.

[jkotas]

These platforms don't support JIT, so inlining and debug info sections in the R2R image are not used at runtime.

Nit: This is not accurate statement. These sections are usable without JIT as well:

• Debug info can be used at runtime to produce line numbers in stacktraces (e.g. Exception.ToString)
• Inlining info can be used to modify code at runtime using profiler interfaces. This feature is under FEATURE_REJIT and it is currently disabled for platforms without JIT, but there is nothing fundamental preventing it from working with interpreter.

It is fine to lose these features for mobile apps. I am just pointing out that it is not really related to JIT support.

[kotlarmilos]

Thanks Jan, updated the description.