Ensure names are added at the end of name section in SPIR-V

* The iterator ++ will skip past nops but this could overrun into subsequent
  sections if they contain only nops (ie. are empty)

renderdoc/driver/shaders/spirv/spirv_editor.cpp

@@ -272,6 +272,9 @@ void Editor::SetName(Id id, const rdcstr &name)
       break;
   }
 
+  if(End(Section::DebugNames) < it)
+    it = End(Section::DebugNames);
+
   InsertOperation(op, it.offs());
 }