[clang] [llvm] [DirectX] Implement UseNativeLowPrecision shader flag analysis (PR #134288)

[Farzon Lotfi via cfe-commits]

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+// RUN: %clang_cc1 -fnative-half-type -finclude-default-header -triple dxil-pc-shadermodel6.3-library -emit-llvm -disable-llvm-passes -o - %s | FileCheck %s --check-prefix=FLAG
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farzonl wrote:

NIT: For future cleanup  and test organization could we move the Shader Flag tests into their own directory like the Builtins have their own directory? Not asking for this PR.

https://github.com/llvm/llvm-project/pull/134288