[SPIR-V] Incorrect RowMajor decoration emitted by DXC

**Description**

Issue encountered while adding tests to the offload test suite:
`test/Feature/PushConstant/array_of_matrices.test`

**Steps to Reproduce**

https://godbolt.org/z/jGef817Ge


**Actual Behavior**

The indices and RowMajor decoration means the indices being accessed are wrong.

**Environment**
- DXC version d6b78b745ec23d65a7f8bf1873bff0f2083deaa0
- Host Operating System Linux