[clang] [HLSL] Change clang Driver Options to not set CXXOperatorNames (PR #126758)

[Chris B via cfe-commits]

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llvm-beanz wrote:

This seems like the wrong place to put this test. We don't need actual codegen here, we just need to make sure it parses.

I'd put this under SemaHLSL and instead use a run line like:
```hlsl
// RUN: %clang_cc1 -triple dxil-pc-shadermodel6.3-library %s -ast-dump | FileCheck %s
```

Restricting test cases to only running the parts of the compiler that are strictly required to verify correctness of a change reduces the time it takes to run the test. While in isolation for a single test that may only be shaving off fractions of a second, in aggregate across the entire test suite it can have a huge impact.

https://github.com/llvm/llvm-project/pull/126758