Matrix-majorness ignored when on nested structure members

Hi,

So basically it's the same issue as described [here ](https://github.com/KhronosGroup/glslang/issues/789) but with the template version of ConstantBuffer.

```
struct Mybuffer
{
row_major float4x4 m_objectMatrix;
float4 vec1;
};

ConstantBuffer MybuffeCB;

float4 main() : SV_Target0
{
return mul(MybuffeCB.m_objectMatrix, MybuffeCB.vec1);
}
```

This shader always generates RowMajor for the m_objectMatrix even if I use "row_major" or "column_major".

Start with the shader reproducer in this issue and compare its behavior with the linked issue #789. Trace the HLSL ConstantBuffer handling and generated matrix-major metadata, then verify that the explicit row_major or column_major qualifier is preserved for nested structure members.

Written by the indexing model from the issue text.