Mac on aarch64 uses posix_memmap.c os_mmap which doesn't do anything with
the flag MMAP_MAP_32BIT for that build so this condition ends up asserting unless
the mapping ends up in the first 4 gigs worth of addressable space.
Thsi PR changes to call os_mmap with MMAP_MAP_32BIT flag only when the target
is x86-64 or riscv64, and the macro __APPLE__ isn't enabled. The behavior is similar
to what the posix os_mmap does.
Make wamrc normalize "arm64" to "aarch64v8". Previously the only way to
make the "arm64" target was to not specify a target on 64 bit arm-based
mac builds. Now arm64 and aarch64v8 are treated as the same.
Make aot_loader accept "aarch64v8" on arm-based apple (as well as
accepting legacy "arm64" based aot targets).
This also removes __APPLE__ and __MACH__ from the block that defaults
size_level to 1 since it doesn't seem to be supported for aarch64:
`LLVM ERROR: Only small, tiny and large code models are allowed on AArch64`
Compilation warnings were reported on mac:
```
core/shared/mem-alloc/ems/ems_gc.c:454:22: warning: passing arguments to 'wasm_runtime_gc_prepare' without a prototype is deprecated in all versions of C and is not supported in C2x [-Wdeprecated-non-prototype]
gct_vm_gc_prepare(NULL);
^
core/shared/mem-alloc/ems/ems_gc.c:466:23: warning: passing arguments to 'wasm_runtime_gc_finalize' without a prototype is deprecated in all versions of C and is not supported in C2x [-Wdeprecated-non-prototype]
gct_vm_gc_finished(NULL);
^
2 warnings generated.
```
