[SPIR-V] OpAccessChain as inline SPIR-V fails

[s-perron]

Description

When a spir-v intrinsic function is defined that generates the OpAccessChain instruction, the follow error message comes up:

Internal Compiler error: cast<X>() argument of incompatible type!

We should see if it is possible to fix. That cannot always be worked around because people may have workgroup pointers that they want to be able to index. We are adding workgroup pointers to the HLSL standard headers files, so we might want to see what we can do with this.

Steps to Reproduce

https://godbolt.org/z/zM3Y74sfG

Actual Behavior
Internal compiler error.

Environment

• DXC version: trunk
• Host Operating System: all

[s-perron]

Fixed by #6720.