Add a Universal2 backend.

[ltfish]

No description provided.

[angr-bot]

Corpus decompilation diffs can be found at angr/dec-snapshots@master...angr/cle_670

[rhelmot]

I disagree with the design that you want to load every slice into memory at once. These slices will have conflicting placement requirements, and moreover having more than one object labeled is_main_bin will wreak havoc downstream. Vedant and I are already seeing crashes when you load a binary with more than two slices.

Can we make it so that if one of these binaries is loaded as the main binary, it'll pick (explicitly overridable) a single arch to load, and if we load a library then we only load the slice for the main binary's arch?

[ltfish]

I'm fine with what you propose, and the change will be pretty small. PR welcome!