Add support for RaytracingAccelerationStructure type for PTX targets (shader-slang#1831)

* enabling command line compiler to output PTX with multiple entry points.

* adding some simple optix intrinsics to slang

* Now handling the kIROp_RaytracingAccelerationStructureType for CUDA. Source seems to generate correctly, but accels are always optimized out of resulting PTX due to no trace calls

* fixing unnecessary diff with master

* allowing unhandled untyped buffers to fall through to super::calcTypeName

Co-authored-by: Tim Foley <tfoleyNV@users.noreply.github.com>

Author: natevm

source/slang/slang-emit-cuda.cpp

@@ -314,6 +314,20 @@ SlangResult CUDASourceEmitter::calcTypeName(IRType* type, CodeGenTarget target,
         }
     }
 
+    if (auto untypedBufferType = as<IRUntypedBufferResourceType>(type)) {
+        switch (untypedBufferType->getOp())
+        {
+            case kIROp_RaytracingAccelerationStructureType:
+            {
+                m_writer->emit("OptixTraversableHandle");
+                return SLANG_OK;
+                break;
+            }
+
+            default: break;
+        }
+    }
+
     return Super::calcTypeName(type, target, out);
 }