MSL: row/column major issue.

the following matrix in HLSL:

```
float4x3 normalMatrix;
```

Gets translated to MSL as:
```
float3x4 normalMatrix;
```

Although the matrix dimensions are correct, the data does not seem to be copied correctly. For instance, an identity matrix ends up in MSL as:

| 1 | 0 | 0 | 0 |
|---|---|---|---|
| 0 | 0 | 0 | 1 |
| 0 | 1 | 0 | 0 |

It looks like we are properly generating a float3x4 matrix but with column-major data layout.

Start by reproducing the HLSL-to-MSL translation for a float4x3 normalMatrix and compare the resulting matrix data with the reported identity-matrix layout. Done means the generated float3x4 preserves the source matrix's row/column data ordering.

Written by the indexing model from the issue text.