[clang] [HLSL] Make casting functions constexpr (PR #108902)

[via cfe-commits]

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+// RUN: %clang_cc1 -finclude-default-header -triple dxil-pc-shadermodel6.6-library %s -verify
+
+// expected-no-diagnostics
+
+// Because asuint should be constant evaluated, all the static asserts below
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joaosaffran wrote:

It looks like an update is missing here:

```suggestion
// Because asfloat should be constant evaluated, all the static asserts below
```

https://github.com/llvm/llvm-project/pull/108902