This commit adds support for legalizing pointer casts between array and
vector types within the SPIRV backend.
This is necessary to handle cases where a vector is loaded from or
stored to an array, which can occur with HLSL matrix types.
The following changes are included:
- Added to load a vector from an array.
- Added to store a vector to an array.
- Added the test case to verify the functionality.
834a3cca31