[clang] [HLSL] Add `[[hlsl::raw_buffer]]` attribute (PR #107954)

[Damyan Pepper via cfe-commits]

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+// RUN: %clang_cc1 -triple dxil-pc-shadermodel6.0-compute -x hlsl -ast-dump -o - %s | FileCheck %s
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damyanp wrote:

Presumably we have tests somewhere for resource handles that don't have raw_buffer on them, and they just don't show up here because they're not impacted at all by this new attribute?

https://github.com/llvm/llvm-project/pull/107954