Correctly copy to resource_desc1 in rawgather test (#4467)

The previous approach was assigning garbage to the final field of desc1
due to alignment padding in desc0 where that field would be.
This just duplicates the utility function behavior to copy one desc to
the new one

Author: Greg Roth

tools/clang/unittests/HLSL/ExecutionTest.cpp

@@ -908,6 +908,23 @@ class ExecutionTest {
     }
   }
 
+#if defined(NTDDI_WIN10_CU) && WDK_NTDDI_VERSION >= NTDDI_WIN10_CU
+  // Copy common fields from desc0 to desc1 and zero out the new one
+  void CopyDesc0ToDesc1(D3D12_RESOURCE_DESC1 &desc1, const D3D12_RESOURCE_DESC1 &desc0) {
+    desc1.Dimension = desc0.Dimension;
+    desc1.Alignment = desc0.Alignment;
+    desc1.Width = desc0.Width;
+    desc1.Height = desc0.Height;
+    desc1.DepthOrArraySize = desc0.DepthOrArraySize;
+    desc1.MipLevels = desc0.MipLevels;
+    desc1.Format = desc0.Format;
+    desc1.SampleDesc = desc0.SampleDesc;
+    desc1.Layout = desc0.Layout;
+    desc1.Flags = desc0.Flags;
+    desc1.SamplerFeedbackMipRegion = {};
+  }
+#endif
+
   // Create resources for the given <resDesc> described main resource
   // creating and returning the resource, the upload resource,
   // and the readback resource if requested, populating with <values> of size
@@ -939,7 +956,7 @@ class ExecutionTest {
       CComPtr<ID3D12Device10> pDevice10;
       // Copy resDesc0 to resDesc1 zeroing anything new
       D3D12_RESOURCE_DESC1 resDesc1 = {0};
-      memcpy(&resDesc1, &resDesc, sizeof(resDesc));
+      CopyDesc0ToDesc1(resDesc1, resDesc) {
       VERIFY_SUCCEEDED(pDevice->QueryInterface(IID_PPV_ARGS(&pDevice10)));
       VERIFY_SUCCEEDED(pDevice10->CreateCommittedResource3(
         &defaultHeapProperties,
@@ -4634,7 +4651,7 @@ void ExecutionTest::DoRawGatherTest(ID3D12Device *pDevice, RawGatherTexture *raw
   for (UINT y = 0; y < yDim; y++)
     for (UINT x = 0; x < xDim; x++)
       rawTex->SetElement(ix++, x, y);
-  D3D12_RESOURCE_DESC tex2dDesc = CD3DX12_RESOURCE_DESC::Tex2D(resFormat, xDim, yDim);
+  D3D12_RESOURCE_DESC tex2dDesc = CD3DX12_RESOURCE_DESC::Tex2D(resFormat, xDim, yDim, 1/* sampCt */, 1/* mipCt */);
 
   CreateTestResources(pDevice, pCommandList, rawTex->GetElements(), valueSizeInBytes, tex2dDesc,
                       &pTexResource, &pTexUploadResource,