[SPIR-V] Local resource arrays of RWStructuredBuffer fail to compile

Description
Cannot create local resource array from RWStructuredBuffer objects.

Steps to Reproduce

RWStructuredBuffer<int> X : register(u0);
RWStructuredBuffer<int> Y : register(u1);

void SomeFn(RWStructuredBuffer<int> B[2], uint Idx, int Val0) {
  B[0] = Y;
  B[0][Idx] = Val0;
}

[numthreads(4,1,1)]
void main(uint GI : SV_GroupIndex) {
  RWStructuredBuffer<int> A[2] = {X, Y};
  SomeFn(A, GI, 1);
  A[0][GI] = 2;
}

Compiler Explorer

Actual Behavior

<source>:11:34: error: Cannot cast initializer type 'RWStructuredBuffer<int>' into variable type 'RWStructuredBuffer<int> [2]'
  RWStructuredBuffer<int> A[2] = {X, Y};
                                 ^
<source>:11:34: fatal error: cannot find the associated counter variable

Environment

• DXC version: All, up to trunk.
• Host Operating System: All

Start by reproducing the HLSL example in the issue through the linked Compiler Explorer setup and confirm the reported diagnostics for local RWStructuredBuffer arrays. No repository file or test is named, so trace the compiler's SPIR-V handling for this construct and add coverage showing that the declaration, function argument, and indexed accesses compile successfully.