llvm 21.1.4-2 (Test)

[Takashi Yano]

The following packages have been uploaded to the Cygwin distribution:

* llvm-21.1.4-2
* libllvm21.1-21.1.4-2
* libllvm-devel-21.1.4-2
* llvm-doc-21.1.4-2
* libpolly-devel-21.1.4-2
* polly-doc-21.1.4-2

The LLVM Core libraries provide a modern source- and target-
independent optimizer, along with code generation support for many popular CPUs
(as well as some less common ones!) These libraries are built around a well
specified code representation known as the LLVM intermediate representation.

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Changes from 21.1.4-1

- Fix profiler symbol visibility to solve link failure.