[aot] Add an 'llvm' aot option which does the same as --llvm. This allows running the AOT compiler with LLVM enabled in aot cache mode.
[aot] Fix a regression introduced by 82c15fa592b23cf466b0683cc3f02f30d7ea8828.
[aot] Make --aot=llvm actually work by passing the flag down to the JIT.