[Matrix] Implement matrix support for the `asint16` HLSL Function

> Note: This issue tracks matrix support for `asint16`. The original implementation issue is [here](https://github.com/llvm/llvm-project/issues/99184).

Matrix requirements:
- [ ] https://github.com/llvm/wg-hlsl/issues/387

## HLSL:

## Syntax

```syntax
int16_t<> asint16(numeric16_only<> x);
```

## Type Description

| Name | [**Template Type**](https://github.com/MicrosoftDocs/win32/blob/docs/desktop-src//direct3dhlsl/../direct3dhlsl/dx-graphics-hlsl-data-types.md)| [**Component Type**](https://github.com/MicrosoftDocs/win32/blob/docs/desktop-src//direct3dhlsl/../direct3dhlsl/dx-graphics-hlsl-data-types.md) | Size |
|-------|--------------------------------------------------------------------|----------------------------------------------------------------------|------|
| *ret* | [**scalar**](https://github.com/MicrosoftDocs/win32/blob/docs/desktop-src//direct3dhlsl/../direct3dhlsl/dx-graphics-hlsl-scalar.md), [**vector**](https://github.com/MicrosoftDocs/win32/blob/docs/desktop-src//direct3dhlsl/../direct3dhlsl/dx-graphics-hlsl-vector.md), or [**matrix**](https://github.com/MicrosoftDocs/win32/blob/docs/desktop-src//direct3dhlsl/../direct3dhlsl/dx-graphics-hlsl-matrix.md) | [**int16_t**](https://github.com/microsoft/DirectXShaderCompiler/wiki/16-Bit-Scalar-Types) | any |
| *x* | [**scalar**](https://github.com/MicrosoftDocs/win32/blob/docs/desktop-src//direct3dhlsl/../direct3dhlsl/dx-graphics-hlsl-scalar.md), [**vector**](https://github.com/MicrosoftDocs/win32/blob/docs/desktop-src//direct3dhlsl/../direct3dhlsl/dx-graphics-hlsl-vector.md), or [**matrix**](https://github.com/MicrosoftDocs/win32/blob/docs/desktop-src//direct3dhlsl/../direct3dhlsl/dx-graphics-hlsl-matrix.md) | [**half**](https://github.com/microsoft/DirectXShaderCompiler/wiki/16-Bit-Scalar-Types), [**int16_t**](https://github.com/microsoft/DirectXShaderCompiler/wiki/16-Bit-Scalar-Types), or [**uint16_t**](https://github.com/microsoft/DirectXShaderCompiler/wiki/16-Bit-Scalar-Types) | any |

## Minimum Shader Model

This function is supported in the following shader models.
|Shader Model | Supported|
|-------------|----------|
|[Shader Model 6.2](https://github.com/microsoft/DirectXShaderCompiler/wiki/Shader-Model-6.2) and higher shader models | yes |

## Shader Stages

## See also

- [**Intrinsic Functions (DirectX HLSL)**](https://github.com/MicrosoftDocs/win32/blob/docs/desktop-src//direct3dhlsl/../direct3dhlsl/dx-graphics-hlsl-intrinsic-functions.md)
- **See [HLSL 16-Bit-Scalar-Types](https://github.com/microsoft/DirectXShaderCompiler/wiki/16-Bit-Scalar-Types)**