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179062b2dc
MacOS platforms using mlir-runner in lit tests consistently hit the
following error:
```
# .---command stderr------------
# | JIT session error: Symbols not found: [ __mlir_ciface_printMemrefI32 ]
# | Error: Failed to materialize symbols: { (main, { __mlir_printMemrefI32, ... }) }
# `-----------------------------
```
https://github.com/google/heir/issues/1521#issuecomment-2751303404
confirms the issue is fixed by using `alwayslink` on these two targets,
and I confirmed on a separate Apple M1 (OSX version Sequoia 15.3.2.).
I'm not an expert on the mlir runner internals, but given the
mlir-runner is purely for testing, and alwayslink at worst adds some
overhead by not removing symbols, it seems low risk.