assert/crash on min16int raw buffer templated Store

Description
ReplaceMinPrecisionRawBufferStoreByType is meant to translate min precision raw buffer stores to full precision store operations. However, for min16int or min16uint types there is a comment which seems incorrect, and an assert is hit.

This comment does not seem correct, since we have a RWByteAddressBuffer templated Store<min16int> operation, not a typed buffer store.
https://github.com/microsoft/DirectXShaderCompiler/blob/bbcbb2de14a67b5d8f4a0bff9b9db274b27b7fc5/lib/HLSL/DxilGenerationPass.cpp#L1029-L1031

When this code attempts to cast the inner type from the resouce type %struct.RWByteAddressBuffer = type { i32 } to a StructType (from i32), the cast fails and aborts compilation:

https://github.com/microsoft/DirectXShaderCompiler/blob/bbcbb2de14a67b5d8f4a0bff9b9db274b27b7fc5/lib/HLSL/DxilGenerationPass.cpp#L1043

Steps to Reproduce

// RUN: %dxc -T vs_6_2
RWByteAddressBuffer BAB : register(u1, space0);
void main(min16int In : INPUT) {
    BAB.Store(0, In);
}

Actual Behavior

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

Environment

• DXC version: current main and releases going back at least to 1.6
• Host Operating System: any

Start in lib/HLSL/DxilGenerationPass.cpp around lines 1029-1043 and reproduce the failure with the provided HLSL snippet using dxc -T vs_6_2. Trace ReplaceMinPrecisionRawBufferStoreByType for the templated RWByteAddressBuffer Store path. Done means the repro compiles without the incompatible cast assertion and the existing behavior for other store types remains intact.