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This is implemented in the Pseudo C plug-in as it shares 99% of the
logic. The Objective-C support is implemented in a subclass of
`PseudoCFunction`. The handling of instruction types that the
Objective-C representation needs to customize is extracted into virtual
functions that the Objective-C subclass overrides.
This currently supports:
* Rewriting `objc_msgSend` / `objc_msgSendSuper2` with constant
selectors to `[receiver message]` notation.
* Rewriting calls to `objc_alloc` / `objc_alloc_init` / `objc_new` to
the equivalent message send notation.
* Rewriting `objc_retain` / `objc_release` and friends to the
equivalent message send notation.
* Displaying Objective-C class references as their class names rather
than `_OBJC_CLASS_$_` symbol names.
* Displaying Objective-C string literals as `@"..."`.
This works best when used in conjunction with
https://github.com/bdash/bn-objc-extras as the reference counting runtime
calls add so much clutter.
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