[clang] [HLSL] Add matrix support for isnan() and isinf() (PR #195586)

[Kaitlin Peng via cfe-commits]

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+// RUN: %clang_cc1 -finclude-default-header -triple dxil-pc-shadermodel6.6-library %s -fnative-half-type -fnative-int16-type -emit-llvm-only -disable-llvm-passes -verify
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kmpeng wrote:

The instructions say to name these files `<intrinsic>_mat-errors.hlsl`. I know the `atan2` files don't follow this convention but I believe other intrinsics do.

https://github.com/llvm/llvm-project/pull/195586