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

[Kaitlin Peng via cfe-commits]

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+// RUN: %clang_cc1 -std=hlsl202x -finclude-default-header -x hlsl -triple \
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kmpeng wrote:

The instructions say to name these files `<intrinsic>_mat-overloads.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