Announcement: Apple M1 port has been added

[vnmakarov]

For some time I've been working on MIR Apple M1 port. Now the port is available.
Apple M1 ABI is different from aarch64 linux. The major differences are:

• long double is actually double.

• Apple M1 has more strict interface to generate JITted code. This results in impossibility to generate JITted code from already JITted code. I don't think it is a big constraints for most users but it created some troubles in bootstrapping c2m compiler. They were overcome by prohibiting JITting a new very small function (_MIR_set_code).

• Apple M1 call ABI is different from linux one and this difference requires always to use prototype for calling vararg functions. It is true for clang and for c2m. Hundreds tests were modified (mostly printf prototypes were added) for this.

[sletz]

Nice, thanks a lot.