[clang] [HLSL] Implement Texture2D::mips[][] (PR #186143)

[Steven Perron via cfe-commits]

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+// RUN: %clang_cc1 -triple dxil-pc-shadermodel6.0-library -x hlsl -emit-llvm -disable-llvm-passes -finclude-default-header -verify %s
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s-perron wrote:

that should be fine. I see other tests in the same directory using `emit-llvm`. Will you be preparing a PR to changes all of them or should I do a PR to change the one I just added.  Let me know the plan.

https://github.com/llvm/llvm-project/pull/186143