Weak aliases on MacOS aren't made global/public

Sample code:

```c
int bar();
int foo() { return 20; }

#pragma weak bar = foo
```

This should make a symbol that is linkable from external libraries, but instead `bar` gets placed in private text. Attempting to link fails.

```text
$ nm a.o
0000000000000000 t _bar
0000000000000000 T _foo
0000000000000000 t ltmp0
0000000000000008 s ltmp1
$ clang b.c a.o    # b.c just tries to call `bar()`
Undefined symbols for architecture arm64:
  "_bar", referenced from:
      _main in b-457c5f.o
ld: symbol(s) not found for architecture arm64
```

On Linux, `bar` correctly gets made a public weak symbol:

```text
0000000000000000 W bar
0000000000000000 T foo
```

This functionality should be supported in MacOS:

- https://github.com/llvm/llvm-project/issues/71001
- https://developer.apple.com/library/archive/documentation/MacOSX/Conceptual/BPFrameworks/Concepts/WeakLinking.html

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Weak aliases on MacOS aren't made global/public #111321

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Weak aliases on MacOS aren't made global/public #111321

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