SamplerDescriptorHeap can be used to load textures.

Description

From HLSL_SM_6_6_DynamicResources, it looks like SamplerDescriptorHeap must be used to access Samplers, not textures.
But if we use it to load a texture, DXC says OK.

Steps to Reproduce

float4 main() : SV_Target {
  SamplerState Sampler = SamplerDescriptorHeap[2];
  Texture2D Texture = SamplerDescriptorHeap[3];
  return Texture.Sample(Sampler, float2(0, 0));
}

dxc -T ps_6_6 repro.hlsl

Actual Behavior

DXC compiles. dx.op.createHandleFromHeap is created, loading a texture from a sampler heap.
As I'm adding this feature in the SPIR-V backend, I'm fine accepting this (since for us both heaps would be the same). But it looks like this should be illegal.

Environment

• DXC version: HEAD
• Host Operating System: linux

Start by running the provided repro with dxc -T ps_6_6 and compare the result with the HLSL_SM_6_6_DynamicResources specification. Trace how dx.op.createHandleFromHeap is generated for SamplerDescriptorHeap and determine the validation point; done means the compiler consistently rejects texture loads from a sampler heap, with coverage for the repro.