Compiler option to disable array bounds-check

[raddad772]

generally, bounds-checking can be more useful during debug than release. This varies per-application I'm sure.

I recently ported NES emulator from pure JavaScript to AssemblyScript and saw 2-3x worse performance. Under advice from the Discord, I then converted all the TypedArray to StaticArrays and put unchecked() around all the accesses, and that alone dropped me to nearly 1:1 performance with the JS original.

That's great and all, but unchecked() is ungainly and if I wanted the debug version to be bounds-checked, I'd need to take it out manually.

It would be nice if there were a compile-time option either to:
a) Disable/enable array bounds-checking altogether,
or
b) Disable/enable unchecked() from actually doing things. That way, we could disable it on compile for debug builds. Note: I do not advocate making debug AUTOMATICALLY do this, because you can do profiling in debug mode that you can't without it.

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