Add support for nv-raytracing-final (#2010)

Add support for nv-raytracing (non-experimental)
diff --git a/source/opcode.cpp b/source/opcode.cpp
index 69c9561..6028c15 100644
--- a/source/opcode.cpp
+++ b/source/opcode.cpp
@@ -324,7 +324,7 @@
     case SpvOpTypePipe:
     case SpvOpTypePipeStorage:
     case SpvOpTypeNamedBarrier:
-    case SpvOpTypeAccelerationStructureNVX:
+    case SpvOpTypeAccelerationStructureNV:
       return true;
     default:
       // In particular, OpTypeForwardPointer does not generate a type,