issues with handling aliased symbols

Hi,

The current version of retrowrite may not properly handle aliased symbols.

An object, such as a function, can have multiple aliased symbols. However, the loading process at https://github.com/HexHive/retrowrite/blob/master/librw/loader.py#L124 just picks the last one. This can cause problems because other references to the same object use the symbol linked to the relocation (e.g., https://github.com/HexHive/retrowrite/blob/master/librw/rw.py#L185) --- the symbol picked by the loading process and the symbol linked to the relocation can be different, though they are aliases.

A safer strategy is to keep all aliased symbols in the assembly file by using the ".set" primitive.

I have committed a tentative "patch" to the repo I forked locally: https://github.com/junxzm1990/retrowrite.

FYI, a tentative "patch" to the naming issues of global symbols I mentioned at https://github.com/HexHive/retrowrite/issues/15 is also committed to my local repo.

Read the symbol-loading logic at librw/loader.py:124 and the relocation reference handling at librw/rw.py:185. Verify how multiple aliased symbols are selected, then preserve all aliases in the generated assembly with the .set primitive so relocation-linked references remain valid.

Written by the indexing model from the issue text.