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FFI/ARM64/OSX: Handle non-standard OSX C calling conventions.

Contributed by Peter Cawley.

(cherry picked from commit 83954100d)

This patch adds FFI support for passing small (< 8 bytes) parameters on
the stack on the OSX arm64 architecture. Also, it fixes the compilation
of FFI vararg functions, since before the patch arguments were passed in
registers instead of the stack [1] for them. JIT machinery now uses
`TREF_NIL` as a marker for the slot from which the variadic arguments
begin.

[1]: https://developer.apple.com/documentation/xcode/writing-arm64-code-for-apple-platforms#Update-code-that-passes-arguments-to-variadic-functions

Sergey Kaplun:
* added the description and the test for the problem

Part of tarantool/tarantool#12480

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