Client may pass a name with AT or PERCENTAGE, but internally MuName
does not contain that.

Ensure that "structs" have names, so that structs can be referred
symbolically. In the future, functions and basic blocks also need to be
ensured to have names. Such names are generated from their IDs if not
provided by the client.

The IR builder can create named or unnamed MuEntityHeader based on
whether it has client-provided name or not.

Can build constants now (currently only Constant::Int).

Also resolves dependency

refactor: put `aot` module and `compile_sharedlib` function under `mu::vm::testutil` module. Also updated some function calls based on updates in master branch

NOTE: Only fixed hand-written ASMs. Emitted ".s" files still have problems.

Implemented dependency resolution.