[clang] [llvm] [HLSL] implement the rcp intrinsic (PR #83857)

[Justin Bogner 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 -disable-llvm-passes -verify -verify-ignore-unexpected
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bogner wrote:

While it's certainly worth exploring the options here I worry that trying to deduplicate these too aggressively could make the tests a lot harder to understand.

https://github.com/llvm/llvm-project/pull/83857