clover: Add explicit handling of denormals
New target-independent handling of denormals was added in llvm/clang 11. Add device query for fp32 denormals and use it to both expose the feature and pass the correct compiler options.
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New target-independent handling of denormals was added in llvm/clang 11. Add device query for fp32 denormals and use it to both expose the feature and pass the correct compiler options.