[clang] Adding `asuint` implementation to hlsl (PR #107292)

[Chris B via cfe-commits]

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+// RUN: %clang_cc1 -finclude-default-header -triple dxil-pc-shadermodel6.6-library %s -fnative-half-type -emit-llvm-only -disable-llvm-passes -verify -verify-ignore-unexpected
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llvm-beanz wrote:

what messages are seen but not expected?

https://github.com/llvm/llvm-project/pull/107292