[GPUCopy] Fixed warning when copying with a compute shader fewer pixels than the numthreads

ScriptableRenderPipeline/Core/Resources/GPUCopy.compute

 // Autogenerated file. Do not edit by hand
 
-#include "ShaderLibrary/Common.hlsl"
+#include "../ShaderLibrary/Common.hlsl"
 
 SamplerState sampler_LinearClamp;
 
 
 RWTexture2D<float1> _Result1;
 
-TEXTURE2D(_Source4);
+Texture2D<float4> _Source4;
 
 
 #pragma kernel KSampleCopy4_1_x

ScriptableRenderPipeline/Core/Resources/GPUCopy.cs

         static readonly int _Size = Shader.PropertyToID("_Size");
         public void SampleCopyChannel_xyzw2x(CommandBuffer cmd, RenderTargetIdentifier source, RenderTargetIdentifier target, Vector2 size)
             {
-                if (size.x < 8 || size.y < 8)
-                    Debug.LogWarning("Trying to copy a channel from a texture smaller than 8x* or *x8. ComputeShader cannot perform it.");
-                cmd.DispatchCompute(m_Shader, k_SampleKernel_xyzw2x, (int)(size.x) / 8, (int)(size.y) / 8, 1);
+                cmd.DispatchCompute(m_Shader, k_SampleKernel_xyzw2x, (int)Mathf.Max((size.x) / 8, 1), (int)Mathf.Max((size.y) / 8, 1), 1);
             }
 
     }

ScriptableRenderPipeline/Core/Resources/GPUCopyAsset.cs

-using System;
+using System;
 using System.Collections.Generic;
 using System.Text;
 
                 // CSharp method
                 csm.AppendLine(string.Format(@"        public void SampleCopyChannel_{0}2{1}(CommandBuffer cmd, RenderTargetIdentifier source, RenderTargetIdentifier target, Vector2 size)", channelName, o.subscript));
                 csm.AppendLine("            {");
-                csm.AppendLine(string.Format("                if (size.x < {0} || size.y < {0})", k_KernelSize.ToString()));
-                csm.AppendLine("                    Debug.LogWarning(\"Trying to copy a channel from a texture smaller than 8x* or *x8. ComputeShader cannot perform it.\");");
-                csm.AppendLine(string.Format("                cmd.DispatchCompute(m_Shader, {0}, (int)(size.x) / {1}, (int)(size.y) / {1}, 1);", kernelIndexName, k_KernelSize.ToString()));
+                csm.AppendLine(string.Format("                cmd.DispatchCompute(m_Shader, {0}, (int)Mathf.Max((size.x) / {1}, 1), (int)Mathf.Max((size.y) / {1}, 1), 1);", kernelIndexName, k_KernelSize.ToString()));
                 csm.AppendLine("            }");
             }
             csc.AppendLine("        }");