[lld] [lld][MachO] Support for -interposable (PR #131813)

[Carlo Cabrera via llvm-commits]

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@@ -204,8 +204,9 @@ Defined *SymbolTable::addDefined(StringRef name, InputFile *file,
 
   // With -flat_namespace, all extern symbols in dylibs are interposable.
   // FIXME: Add support for `-interposable` (PR53680).
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carlocab wrote:

Have a look at https://github.com/llvm/llvm-project/tree/main/lld/test. In particular, the MachO directory.

These links might also help:
- https://www.llvm.org/docs/TestingGuide.html
- https://llvm.org/docs/CommandGuide/lit.html
- https://llvm.org/docs/CommandGuide/FileCheck.html

https://github.com/llvm/llvm-project/pull/131813