[clang] [lldb] [llvm] [OpenCL][Clang] Add support for cooperative matrix extension (PR #221328)

[Sven van Haastregt via cfe-commits]

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+// Tests for coop_mat_init and coop_mat_length — Sema (positive).
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svenvh wrote:

```suggestion
// Positive tests for coop_mat_init and coop_mat_length.
```

https://github.com/llvm/llvm-project/pull/221328