Warn a function is hand-written if it contains certain instructions

[ethteck]

Many people, myself included, might not necessarily be aware when a function is hand-written. If a function contains add, sub, or addi, though, it definitely is. We should still support these but warn the user the function is hand-written if it contains any of them.

[JoshDuMan]

To add a few more instructions/things, most based around the cache:
bal, mtc0, mfc0, tlbr, tlbwi, cache
Anything with a $k# register