[SPIR-V] Add debug type for acceleration structure (#6562)

- This change adds a switch case for TK_AccelerationStructureNV in
lowerToDebugType
- Before, compiling a shader for vulkan containing an acceleration
structure and using -fspv-debug=vulkan-with-source would cause a crash.

Fixes #5113

Author: rj123-nv

tools/clang/lib/SPIRV/DebugTypeVisitor.cpp

@@ -405,6 +405,10 @@ SpirvDebugType *DebugTypeVisitor::lowerToDebugType(const SpirvType *spirvType) {
         spvContext.getDebugTypeFunction(spirvType, flags, returnType, params);
     break;
   }
+  case SpirvType::TK_AccelerationStructureNV: {
+    debugType = lowerToDebugTypeComposite(spirvType);
+    break;
+  }
   }
 
   if (!debugType) {

tools/clang/test/CodeGenSPIRV/raytracing.nv.debug.hlsl

@@ -0,0 +1,54 @@
+// RUN: %dxc -spirv -Zi -O0 -T lib_6_5 -D HLSL6 -fspv-target-env=vulkan1.2 -fspv-debug=vulkan-with-source -fvk-use-gl-layout %s | FileCheck %s
+
+// CHECK: [[set:%[0-9]+]] = OpExtInstImport "NonSemantic.Shader.DebugInfo.100"
+// CHECK: [[AS:%[0-9]+]] = OpString "@accelerationStructureNV"
+// CHECK: [[US:%[0-9]+]] = OpString "accelerationStructureNV"
+// CHECK: [[DI:%[0-9]+]] = OpExtInst %void [[set]] DebugInfoNone
+// CHECK: [[DS:%[0-9]+]] = OpExtInst %void [[set]] DebugSource
+// CHECK: [[CU:%[0-9]+]] = OpExtInst %void [[set]] DebugCompilationUnit
+
+// CHECK: {{%[0-9]+}} = OpExtInst %void [[set]] DebugTypeComposite [[AS]] %uint_1 [[DS]] %uint_0 %uint_0 [[CU]] [[US]] [[DI]] %uint_3
+struct hitPayload
+{
+  float3 hitValue;
+  uint seed;
+};
+
+RaytracingAccelerationStructure topLevelAS; 
+RWTexture2D<float4> image;
+
+[shader("raygeneration")]
+void main()
+{
+  const float2 pixelCenter = float2(DispatchRaysIndex().xy) + float2(0.5, 0.5);
+  const float2 inUV        = pixelCenter / float2(DispatchRaysDimensions().xy);
+  float2       d           = inUV * 2.0 - 1.0;
+
+  float4 origin    = float4(0,0,0,1);
+  float4 target    = float4(d.x, d.y, 1, 1);
+  float4 direction = float4(normalize(target.xyz), 0)   ;
+
+  uint  rayFlags = RAY_FLAG_FORCE_OPAQUE;
+  float tMin     = 0.001;
+  float tMax     = 10000.0;
+
+  RayDesc desc;
+  desc.Origin = origin.xyz;
+  desc.Direction = direction.xyz;
+  desc.TMin = tMin;
+  desc.TMax = tMax;
+
+  hitPayload prd;
+
+  TraceRay(topLevelAS,    
+          rayFlags,       
+          0xFF,           
+          0,              
+          0,             
+          0,              
+	  desc,
+          prd
+  );
+
+  image[DispatchRaysIndex().xy] = float4(prd.hitValue, 1.0);
+}